COURTNEY SNYDER MD - HOLISTIC PSYCHIATRIST
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Mast Cell Activation & Inflammation in Brain Disorders: How to Calm Things Down

5/17/2020

39 Comments

 
Picture
“Tree” - Cut paper, ink and acrylic on wood canvas, 12 x12” (by Courtney Snyder)
By Courtney Snyder, MD

This post goes out to those who are unknowingly deep in the throes of mast cell activation and/or brain inflammation.  

Though our culture is only starting to consider psychiatric conditions as inflammation of the brain, if you or someone you know has panic attacks, depression, mood swings, ADHD, brain fog, chronic fatigue, PTSD, autism, cognitive issues or even dementia, then you know the destruction neuroinflammation plays in people’s lives.  ​
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Understanding brain inflammation can make the difference in the stories we tell ourselves about ourselves.  It can make a difference between feeling shame or feeling we’re having any other symptom like an inflamed joint or a rash.  It can make the difference between years of suffering and getting help or making needed lifestyle changes. This awareness can even make the difference between whether someone chooses to live or die. For physicians, therapists and other practitioners, it can impact how they interact with those who they are there to help.

Tweaking neurotransmitter functioning, the primary role of modern conventional psychiatry, isn’t the same as treating inflammation in the brain.  While psychotropic medications may help lessen symptoms (and can be life saving), they don’t address root causes including inflammation. In those with high immune reactivity, they may even trigger an inflammatory response themselves. 


In this post, I’ll do my best to lay out the science as well as speak to the personal experience of brain inflammation. Because this topic requires explanation, I’ve tried to make it easy to jump ahead to find areas of interest. First some definitions:

Inflammation - is a good thing. It’s a protective response to injury or infection. It helps remove the problem (toxin, infection) and start tissue healing.  


Neuroinflammation - is when the central nervous system (the brain and spinal cord)  is involved.

Neuroimmunology - the study of this interface between the immune system and the central nervous system.

Neuroimmunoendocrinology - the study of the interface between the immune, central nervous and endocrine (hormonal) systems. These systems can influence each other in many directions, but for now, know that we have a stress hormone from the brain that activates the immune system to act on the brain and the body. 

Psychoneuroimmunoendocrinology - the study of how psychological and emotional stress can cause a hormone to be released from the brain (in an attempt to increase cortisol) that activates the immune system to inflame the brain (and body).  When you hear “stress causes inflammation”, that’s what they’re talking about. 

What’s Happening at a Cellular Level?
Meet what I think are the three most important players when it comes to brain inflammation and thus psychiatric conditions.  Later, I’ll explain how they work together to cause symptoms and how we can calm them down so we can heal and eventually thrive.

1 - Mast Cells
  • Part of the immune system - they mediate immune, allergic and inflammatory responses 
  • Everywhere in the body, but especially concentrated in areas in direct contact with the outside (skin, respiratory, digestive and urinary tract)
  • Sensors - they sense what is going on in the tissues
  • First responders when the body perceives a threat (toxins, infection, etc.) 
  • They act fast (resulting symptoms occur quickly after a trigger) 
  • Great communicators - they have granules/ bags with many inflammatory mediators that, when released, do many helpful and potentially destructive things 
  • Those mediators communicate with a lot of other cells and tissues which is why they can cause so many seemingly unrelated symptoms throughout the body and brain
  • Can be triggered to release those mediators by toxins, unwelcome microbes, chemicals, heat, cold and emotional stressors, among other things
  • Can be triggered by CRH (see below) - a stress hormone from the brain

2 - Microglial Cells 
  • Also part of the immune system, but in the brain  
  • Job - remove damaged neurons, waste and things that aren’t supposed to be there and to keep the brain healthy
  • Activated by mast cells 
  • Can be activated by CRH (stress hormone from the brain described next)
  • Too much activation means too much cleaning up (excessively scrubbing any part of your body leads to inflammation and then tissue destruction- in this case brain cells/tissue)

3 - CRH Corticotropin Releasing Hormone (or Factor) 
  • A hormone released from part of the brain when we are under stress (physiologic or emotional)
  • It’s also released from mast cells 
  • There are receptors for CRH on mast cells and on microglial cells - when it hits those receptors, it activates those cells to do their thing which is to create inflammation
  • This helps explain how emotional stress causes “inflammation” and why lowering inflammation in the body and brain requires lowering stress in our lives and our stress response (and why I’m glad I’m a psychiatrist). In short, supplements, medication and dietary changes alone are not enough
    • RCCX theory suggests that about 15-20% of us have a mutation in  an enzyme in our stress hormone pathways.  This seemingly results in us having more CRH released when our body (or brain) is under stress, which means more mast cell and microglial activation, leading to more inflammation.  It also means we will be more prone to brain related symptoms and certain health issues and, therefore, need to be more intentional about lowering our stress response, as well as avoiding toxins and keeping our microbiome healthy.

These three players are essential.  All is good until the burden or threat is greater than our ability to manage it.  Examples would be if there is:
  • A lot of toxicity (chemical, metal, or from mold, yeast or other microbes),
  • Unwelcome microbes that aren’t easily removed (lyme, a virus, mold, yeast overgrowth) or
  • If we are chronically stressed, have experienced a traumatic event, or have the dysregulated stress response that comes with inadequate or disrupted early attachment or and more often...
  • A combination of any of these.

These “stresses” call for more cortisol and to get more cortisol, the brain releases more CRH/ Corticotropin Releasing Hormone, which tells the adrenal glands to make more cortisol.  This increased CRH (which again binds mast cells and microglial cells) leads to more mast cells being activated - dumping their mediators which activate more microglial cells (in the brain) resulting in brain inflammation and disrupted neuronal connections. Chronic inflammation can lead to cell and tissue death which is what we call neurodegeneration. The most common example is dementia.  

GENETICS
While there is certainly evidence that there is a genetic vulnerability to mast cells becoming overly active, I and others would argue that toxicity (especially mold toxicity) tends to take it to another level. 

ASSOCIATED DIAGNOSES
Mast cell activation occurs in asthma, allergies, arthritis, cardiovascular disease, interstitial cystitis, psoriasis, atopic dermatitis, cancers and metastasis, endometriosis, obesity, ulcers, prostatitis, periodontitis, irritable bowel syndrome and inflammatory bowel disease. 

Research, however, is also showing the role of mast cells in traumatic brain injury, multiple sclerosis, Parkinson’s disease, dementia, Alzheimer’s disease, stress conditions, sleep disorders, migraine, pain, ADHD and autism.

TYPES OF MAST CELLS
Mast cells are everywhere. We have 2 types, the mucosal type (lining of the gastrointestinal, respiratory and urinary systems which have “mucosa”) and the connective tissue type (in those tissues that hold us, our organs and our blood vessels together, including our skin).   Because they are especially concentrated in places with direct contact with the outer environment (skin, GI tract, bladder, sinuses), they’re our first line of defense against toxins and unwelcome microbes. This is why the more common mast cell symptoms involve the skin, GI tract, sinuses, lungs and bladder.


MAST CELL ACTIVATION
Though patients and parents of patients contact me for their brain related symptoms, such as depressed mood, anxiety, inattention, restlessness, insomnia, agitation, mood, swings, intermittent personality changes or even mania, most also have other physical symptoms of mast cell activation. I’m not sure how much of this is because my practice attracts those with complex illness or because I simply ask about these symptoms - symptoms they might not think to mention.  Nonetheless, one does not to have a plethora of physical symptoms to be suffering the consequences of brain inflammation.

MAST CELL ACTIVATION SYNDROME/MCAS
Those with Mast Cell Activation Syndrome have many signs and symptoms related to the activation of mast cells. Their symptoms are unpredictable and varied.  

TRIGGERS
Common triggers which activate mast cells to release their mediators are:
  • specific foods and drinks (especially alcohol, high-histamine and/or high carb foods)
  • temperature extremes, high altitude, drops in barometric pressure
  • airborne smells including perfumes, detergents, chemical smells, or smoke
  • exercise or exertion
  • emotional stress
  • hormonal changes (especially during adolescence, pregnancy and women's menstrual cycles)
  • electromagnetic fields / EMF (such as from cell phones, wifi, smart devices, and more)
  • excessive histamine (due to allergens, undermethylation, DAO insufficiency (due to a mutation in an enzyme that breaks down histamine from food in the GI tract).

MAST CELL SYMPTOMS
As you'll see below, there are many symptoms. While triggers can vary from person to person, so can symptoms.  Triggers and symptoms can be unpredictable and vary from episode to episode.

General
Fatigue 
Appetite swings - including excessive appetite after beginning to eat
Episodes of low body temperature
Temperature (hot/cold) sensitivity 
Sense of being cold all the time
Difficulty exercising 
Difficulties with anesthesia
Unexplained medication reactions 

Gastrointestinal
Nausea and/or vomiting
Difficulty swallowing, throat tightness
diarrhea or constipation
Gastrointestinal pain or discomfort 
Bloating and gas of irritable bowel syndrome
Liver/spleen pain

Immune
Anaphylactic reactions  - ie. difficulty breathing, itchy hives, flushing or pale skin, feeling of warmth, weak and rapid pulse, nausea, vomiting, diarrhea, dizziness and fainting
Enlarged lymph nodes
Recurring infections

Reactivity
Medication intolerances 
Chemical intolerance - ie. fragrances or off-gassing in stores 
Reactions to certain foods or drinks
Odd (or exaggerated)  reactions to insect bites or stings 

Eyes
Sensitivity to sunlight or bright light
Blurred vision 
Dry eyes 
Eye pain 
Conjunctivitis, “bloodshot” eyes

Ears
Hearing loss 
Intermittent tinnitus 

Nose
Nasal congestion
Sinus infections or problems
Scents/odors/chemical reactions
Nosebleeds

Mouth
Mouth Sores 

Respiratory
Cough 
Wheezing 
Shortness of breath  

Cardiovascular
Chest pain 
Sudden drops in blood pressure
Tachycardia (racing heart rate)

Genitourinary
Frequent urination
Painful urination
Bladder/kidney pain

Skin
Rashes
Itching 
Skin lesions or sores
Spots 
Redness
Hives
Flushing
Skin feels on fire
Severe sweating 
Swelling & inflammation
Easy bruising

Musculoskeletal
Joint, bone pain

Neurologic
Headaches
Migraines 
Dizziness 
Lightheadedness 
Fainting /Varying degrees of fainting
Vertigo or problems with balance 
Unexplained weakness  - “jelly legs”
Difficulty walking
Numbness & tingling in face and extremities
Strokes
Nerve pain
Persistent body/tissue pain 

Psychiatric
Intense anxiety or panic attack
Depression
Mood swings
Agitation or anger
Severe fatigue
Insomnia
Brain fog
Problems with memory

Other signs that may be less acute, but are nonetheless related:
Anemia
Easy bruising 
B12 Deficiency
Thyroid problems
Enlarged liver or spleen
Difficult menses (females)
Hair loss
Osteoporosis and osteopenia (including young patients) (m)

LIFE WITH MAST CELL ACTIVATION SYNDROME / MCAS

Multiple Systems, Multiple Specialists
If you have MCAS, you may have strange symptoms, and/or you may have a lot of symptoms that by themselves would not be of concern.  You may just think it’s bad luck. Either way, you can’t put your finger on the problem and neither can the psychiatrist, the dermatologist, the neurologist, the ENT, the pulmonologist, the cardiologist, the urologist, the gynecologist, the allergist or the ophthalmologist who each look at  just one part of your body.

Without answers, you may conclude that in some way you are the problem - it must be anxiety or psychological issues at play.  After all, you seem anxious and depressed. And likely you are - and not just because you're physically sick, or because you’re demoralized by the medical system, but also because your brain is inflamed like other parts of your body. You eventually decide seeking help causes more harm than good. The fatigue leaves you moving through sludge. The brain fog keeps you from being able to organize your thoughts enough to try to solve problems or to make plans.  


The Illusion of Control
If you have even recognized that there are triggers, you become seduced by a seeming level of control.  Just when you think you have identified and removed the trigger, the rug is pulled out from under you and you’re hit again with what feels like the flu - headache, body aches, depressed mood, fatigue, inattention and whatever mast cell symptoms plague you. Only after the fog clears, if it clears, are you able to wonder about triggers.  When you’re not blaming yourself for your symptoms, you’re trying to figure out what else you could avoid or do to prevent them. You become consumed with your health. Not because you’re a hypochondriac, but because your limbic system is sensing a problem - a danger. And you’re trying desperately to figure it out.

Relationship to Your Body
Your body is not only defying you, it’s triggering you.  With every unusual symptom comes a reminder that things aren’t right. That your tests results show nothing gives you no solace.  How long will it be before the MS or early onset dementia or other yet to be diagnosed neurological condition is advanced enough to show up on tests. Your mind looks for answers and lands on extremes. You think you're worried because of the symptoms and if the symptoms were gone, that your worries and fear would be too. It never occurs to you that the anxiety might be just another symptom from the same source as the palpitations or the itching and that one isn’t necessarily or only leading to the other. 

Relationship to Others and Work
How can you be so reactive to so many things?  When did you become one of those people who has everything wrong with them; one who can’t harness enough energy or interest to stay connected with friends or even easily engage with those they love. One who has so many abilities, but no fuel, no motivation, and at times not even an ability to care. Caring requires energy. The sick irony is that you don’t look sick. You look normal. You don’t even have a diagnosis to tell people. You may feel alone even with those you love.

Relationship to the Future
After being knocked down figuratively and literally so many times, you’re afraid to feel hopeful.  Will things ever change? You hope they will, but all the paths (the doctor’s appointments, the avoidance, the dietary restrictions) you’ve taken have only led to shame, isolation and further suffering.  If you have had mast cell activation and brain inflammation, you have likely said to yourself, “I don’t want to live like this anymore”, when you were in the throes of an episode.  I have no doubt that there are many individuals, if not most, who have taken their lives, never knowing that at the root of their suffering was a dysregulated immune system and, at that moment of their deepest despair, their mast cells and microglial cells were causing their brain to be inflamed. They couldn’t imagine that despair would pass (with the subsiding of the episode) or that this type of inflammation can be treated. 


INSIDE MAST CELLS - MULTITUDE OF MEDIATORS
As I said earlier, mast cells contain granules (little bags) of ready to go inflammatory mediators.  These messengers communicate with other cells and tissues which is another reason there are so many symptoms. You may recognize the names of some of these mediators: histamine, tryptase, chymase, tumor necrosis factor-alpha (TNF-alpha), serotonin, heparin, proteoglycans and vascular endothelial growth factor (VEGF).  And if that list isn’t long enough, another source adds the following inflammatory mediators:  IL-1beta, IL-8, IL-33, chemokine, ligand 2, CCL3, CCL5, GM-CSF, metalloproteinase (MMP’s), ROS, substance P, dopamine, TGF-beta, corticotropin-releasing hormone (CRH), neurotensin, prostaglandin D2, leukotrienes, proteases tryptase and chymase.   

You’ll likely recognize a couple of these neurotransmitters - serotonin important for improving our mood and lowering our anxiety and dopamine important for mood and focus. Perhaps this explains why right before becoming sick, many people will feel especially good and focused or why some children with autism can have great clarity and increased speech right before they become sick.  This might too explain when some people have mood swings from high to very low...very quickly.

OUTSIDE OF MAST CELLS - RECEPTORS
Mast cells not only release inflammatory mediators, they also have receptors for many of those mediators including CRH (which again is a stress hormone released from the brain, but also from other mast cells).  So, when mast cells “degranulate” or dump out the contents of those granules, those mediators can communicate with other mast cells. When mast cells are activated, lots of things can be released to fight threats, but when they're persistently activated  (because of a persistent threat) some of these mediators can destroy surrounding tissue.  

EXAMPLES OF EXAGGERATED IMMUNE RESPONSES
Though it’s not so hard to imagine how an exaggerated immune response could cause someone to breakout into hives, have an asthma attack or even go into anaphylaxis after eating a peanut, it’s less obvious how an exaggerated immune response affects the brain.  Consider the similarities between how one might feel if they have the flu (fatigue, brain fog, down mood) and if they have depression.  They’re not so different.  One is just lasting much longer.   The similarities between anaphylaxis and panic attacks are even more dramatic.

Anaphylaxis - a mast cell mediated allergic response that occurs within minutes (or even up to 30 minutes) after exposure to an allergen (like a peanut). 
Symptoms include:
  • Hives
  • Itching
  • Flushed or pale skin
  • Low blood pressure (hypotension)
  • Constriction of your airways and a swollen tongue or throat, which can cause wheezing and trouble breathing
  • Weak and rapid pulse
  • Nausea, vomiting or diarrhea
  • Dizziness or fainting

Panic Symptoms come on suddenly and can be triggered by certain situations. 
  • Shortness of breath
  • Dizziness
  • Nausea and/or abdominal cramping
  • Racing heart rate
  • Chills or hot flashes
  • Sweating
  • Headache
  • Tingling sensations on the skin
  • Derealization
  • Chest pain
  • Tunnel vision
  • Agitation or aggression

So yes, while a peanut in one person can trigger anaphylaxis, an emotional trigger (ie. a sensation associated with a traumatic event, or an upsetting thought) can trigger mast cell activation and thus a panic attack.  Despite the classic understanding of panic, it is very likely that some people having panic attacks are reacting to physiologic triggers (e.g. something they ate or inhaled) as opposed to psychological triggers.

WHERE THE IMMUNE SYSTEM & BRAIN MEET

Blood Brain Barrier and Gut Blood Barrier
When mast cells are stimulated they disrupt and release mediators that increase the permeability of what we call the Blood Brain Barrier (BBB) and Gut Blood Barrier (GBB). 

The blood brain barrier is the barrier between our blood (which is carried throughout the body through blood vessels) and our brain.   If you are an unwelcome toxin or microbe that has been ingested and you make your way through the gut blood barrier, into the blood and then up and through the blood brain barrier, the neuroimmune system is going to try to get rid of you. When the body has more toxins or unwelcome microbes than it can manage, there can be an exaggerated immune response impacting surrounding brain tissue. 

Microglial Cells
Mast cells can also recruit other inflammatory cells and activate microglia (the immune cells in the brain).  Though they're there to clean up unwanted dead cells and repair brain tissue, if they’re getting too much activation, they will release their own inflammatory mediators causing local inflammation and disrupted connections between neurons.  If this goes on too long, nearby neurons will die which leads to neurodegeneration which can equate to the beginning of dementia. This is why there is a strong correlation between brain related disorders in younger people, ie children with ADHD, or adults with depression, PTSD, head trauma and later dementia.

EVALUATION 

While there is detailed, complicated and not terribly reliable testing for mast cell activation, I rely on in-depth questionnaires, a thorough history and a response to treatment as my guide, including:


  • Detailed family history - usually there is evidence of mast cell activation related diagnoses. Fitting with RCCX theory, joint hyper-mobility (being flexible, double jointed, etc) in an individual or their family, is a red flag for mast cell activation.
  • Very detailed “review of symptoms” - including all the symptoms above (and others that might point me in other directions)
  • Very deep timeline - listening for early attachment disruption, emotional or physical trauma, including head trauma, environmental and toxic exposures, evidence of infections (Lyme, bartonella, etc).
  • Because there is such a strong association with mold toxicity, a detailed environmental history is part of the timeline - if the person has ever lived, worked or spent extensive time in spaces with water damage (not that it’s always known)
  • Inquire about triggers - if known

TREATMENT

  • Education, education, education.  This is a double-edge sword.  On one hand, it typically helps the person step outside of their symptoms and watch what is going on.  They can realize that inflammation usually will pass, and that treatment can help to lessen their symptoms while we identify what is causing the inflammation in the first place. On the other hand, learning that one’s symptoms may be due to certain triggers such as certain food, or weather changes, etc, if someone has not already started to realize this, can lead to a level of vigilance that is problematic in of itself and even be triggering.
  • Avoiding known triggers (for that person) - this could be hot baths, overeating, skipping meals, perfumes, off gassing in stores, or a narcissistic family member
  • Stabilize mast cells (so they’re not releasing all those mediators) - There are a number of interventions that can help with this. Sometimes, layers of various interventions are needed.
    • Access the vagus nerve (which helps stabilize mast cells) 
    • My favorite 2 supplements for stabilizing mast cells are:
      • Quercetin (with or without Bromelain) - if taken 30 minutes before meals can stabilize mast cells in the gastrointestinal tract, so that eating itself isn’t leading to a level of mast cell activation. 
      • CBD oil - has been shown to help with depression, sleep, anxiety and pain, likely in part because of its mast stabilizing effects.
      • Others
        • Natural supplements - Mast-ease, Perimine, AllQluer
        • Medication - Ketotifen, Cromolyn sodium
  • Block Histamine Receptors - If we could completely stabilize mast cells, we wouldn’t need antihistamines, but we do both to provide as much relief as possible.  Histamine is just one of the mediators that mast cells release, but one that can further trigger mast cells to become activated.  It can cause a lot of well-known physical symptoms (skin issues, upper respiratory allergies), but also brain fog, fatigue and depression, especially for those who are undermethylated, and because of thi,s don’t break down histamine very well.
    • Antihistamines  (to block H1 receptors) - While many people with simple seasonal allergies can benefit from one 24 hour antihistamine, those with mast cell activation often can benefit from one twice a day or even three times a day.  Surprising to many, this can help with brain fog, fatigue and even addictive type behaviors that histamine seems to drive.  This can be a good tool to use initially while we identify and treat root causes.
    • H2 blockers (to block H2 receptors) - which decrease stomach acid (ie. Zantac and Pepcid). Though not an approach I typically use, I mention it, because it is a common approach to treating mast cell activation. 
  • Remove Sources of Histamine and Inflammation
    • Lower allergen exposure:
      • Respiratory
        • Air purification (even if simply making your own $25 one with a box fan, air filter and duct tape.)
        • Allergy covers for bed and pillow
    • Anti-inflammatory, and if necessary, histamine lowering dietary changes 
      • Sugar is inflammatory for everyone for a number of reasons 
      • Gluten and Casein - most people with brain related symptoms can benefit from taking these out of their diet
      • Any other known food that one is reacting to.
      • There are foods that are especially high in histamine. Some people with mast cell activation will feel better removing these or taking a DAO/Diamine Oxidase supplement to breakdown histamine in the GI tract prior to a high histamine meal. 
        • Products of fermentation are high in histamine - ie. wine and other forms of alcohol, vinegar (in a lot of sauce type products, ie. ketchup, mustard, mayo, soy sauce, yogurt, kefir, kombucha)
        • Leftovers, especially left over animal protein - beef, chicken, pork, fish, etc,
        • Beef (because it goes through an aging process) is higher in histamine than chicken
        • Avocado, cinnamon, citrus, and tomato products are also high in histamine
        • See histamine ratings for specific foods
  • Address Toxicity.  In my experience, mold toxicity, because of the way it disrupts the immune system is the most common cause of mast cell activation.   Because removing mold toxins (and other toxins) and treating mold colonization or other biotoxin related illness (Lyme, bartonella, etc.) can trigger mast cell activation, stabilizing mast cells and blocking histamine receptors, for some people, can make the treatment move along more smoothly.
  • Address Digestion & the Microbiome. Undigested food in the lower digestive tract can be a source of fermentation, toxicity and inflammation.  Some individuals can benefit from support with digestive enzymes and a supplement called Betaine HCl. If mold toxicity is present, which again in my experience, usually is, then removing mold toxins and treating yeast and mold in the digestive tract become the priorities. Many individuals can’t tolerate probiotics or anti-fungal herbs, supplements or medication until the mold toxins are starting to be removed with mold toxin binders. 
  • Address Nutrient Status - Because I’ve written about copper overload, undermethylation and pyrrole disorder in other posts, I won’t focus on those here. But, know that rarely does someone have mast cell activation or nutrient imbalances in isolation.  Those who are vulnerable to nutrient imbalance and those with mast cell activation are overlapping (if not the same) populations. In fact, if you look closely at the list of pyrrole symptoms, you will see that most are similar to those of mast cell activation ( and connective tissue symptoms). It is arguable that pyrroles are actually the waste product of the weakened enzyme (21 hydroxylase) that 15-20% of us may have. It does have a pyrrole structure in it.  As for methylation, we need methylation to break down histamine.  If you are periodically being slammed with histamine because of mast cell activation and you are undermethylated and thus don’t break it down well, then you likely would be symptomatic before someone who is not.  It is not uncommon to be undermethylated, then have mold toxicity, which leads to mast cell activation.

And last, but not  least....

  • Address the Hormonal Stress Response - It’s easy for one to hope that supplements and medication will do all the work, and then not take seriously the idea of lowering stress in their lives. If people don’t heed this in the beginning, they often will learn that their healing is dependent on them addressing the faulty rewiring that can occur as a result of mast cell activation and brain inflammation.  On the other side of all of these health issues, most people find that they have disassembled and rebuilt their lives in ways they never would have but for becoming sick. Self-care becomes a priority along with attention to diet, sleep and exercise (as tolerated).  Healthy relationships with appropriate boundaries becomes the new standard.  Work that might have once been stressful and mostly ego promoting is replaced by work that is more satisfying and meaningful. 
    • Neural Retraining. This treatment isn't specific to mast cell activation. One program in particular is the Dynamic Neural Retraining System, created by Annie Hopper.  A similar program that I have less experience with is the Gupta Program Brain Training. Both are based on the understanding of neuroplasticity and our ability to essentially rewire our brain to strengthen pathways that are less triggering for us. Even before addressing toxicity, there can be dramatic results.
    • Befriend Your Body that you have felt at odds with and triggered by for some time.  The body is where we ultimately find calm (as opposed to our head) - yoga, breathing, stretching, walking, dancing or any form of movement.
    • Practice Gratitude - this is part of rewiring the brain - it helps us scan our days and lives for the good. The more of this wiring there, the less room there is for fearful, vigilant and triggering wiring that can be inevitable for some with mast cell activation.
    • Learn and Practice Embracing Uncertainty. This may sound like a spiritual approach.  It is. As long as we think things need to turn out a certain way, we are creating stress in our lives and secondary inflammation in our bodies (and brain tissue). Yes, we can set goals, do our hard work and have our desires, but hold them gently, don’t grasp too tightly. Stay open and curious of what will unfold.
    • Learn to be Mindful and Present - Use whatever practice works for you. Learn to meditate, do art, sing, do anything that opens your mind  and moves you away from relying too heavily on detail thinking.  
    • Exercise your right hemisphere - again give your left hemisphere, which hones on every detail, a rest. There  are a number of feel-good strategies in my last post.
    • Access the Vagus Nerve - which I look forward to writing about in a future post.

THE INFLAMED COLLECTIVE
People in families, workplace settings, schools or even larger communities where there is a shared toxic exposure, can be unknowingly dealing with consequences of collective brain inflammation. I have little doubt that many marriages have ended because of brain inflammation. It’s not a stretch to see how living in our increasingly toxic and stressful world could be contributing to a collective that is less happy, less focused, less engaged and with greater suffering.  Mast cell activation and brain inflammation aren’t new.  They’re just becoming increasingly common as can be seen by the dramatic escalation in associated medical and psychiatric conditions.

THE PIONEERS (from my perspective)

MAST CELL ACTIVATION
Dr. Lawrence Afrin (MD) wrote the pioneering book,Never Bet Against Occam: Mast Cell Activation Disease and the Modern Epidemics of Chronic Illness and Medical Complexity. He and the mast cell community that follows his work are especially focused on the diagnosis and treatment of mast cell activation (and seemingly less on root causes such as mold toxicity or even a stress hormone pathway vulnerability).  If you want to dig deeper into the physiology and available testing, I would highly recommend his book.  

Dr. Theoharis Theoharides (MD, PhD), Professor of Immunology and mast cell researcher at Tufts University, was the first to show that mast cells can be activated by CRH/corticotropin-releasing hormone, which is key in understanding the onset of disease or worsening of disease when under stress.

RCCX THEORY
Dr. Sharon Meglathery (MD), a psychiatrist and internist, described RCCX theory - a brilliant and complex theory that explains how some (15%-20%) of us are wired for mast cell activation because we have a weakened 21 hydroxylase enzyme due to a range of mutations on the gene for it.   Because of this, we have more CRH being released when under physiologic or emotional stress. This theory (in addition to connecting a number of other dots) drives home the importance of addressing inflammation by addressing this stress response in those with psychiatric and chronic complex medical illnesses.

MOLD TOXICITY & MAST CELL ACTIVATION
Dr. Neil Nathan (MD) is a pioneer in the treatment of mold toxicity and complex illness.  He is also the author of TOXIC - Heal Your Body from Mold Toxicity, Lyme Disease, Multiple Chemical Sensitivities, and Chronic Environmental Illness, and my mentor. He and many others in the environmentally acquired illness community are not focused on RCCX theory, and find mold toxicity to be the most common root cause of mast cell activation. They also find that when mold toxicity is treated (which can take time) mast cells typically settle down and the inflammation (in the brain and body) become less of an issue.  That being said, interventions that lower the stress response, such as DNRS are regularly prescribed tools for treating mast cell activation while, or even before, directly addressing mold and other forms of biotoxicity.

LASTLY,...
FOR THE READER WITH BRAIN INFLAMMATION &/OR MAST CELL ACTIVATION:
It’s always my hope that sharing some of what is being learned will help someone out there reconsider the stories they have about themselves, their symptoms and even their lives.  And, it is my hope that the next time someone reading this has a panic attack, an episode of depression, a tantrum out of the blue, severe brain fog, fatigue or even a suicidal thought, that they’re able to pause and be curious instead of being swept away by their faulty beliefs in that moment.  Even if you don’t remember anything I said about mast cells, microglial cells or CRH, ​I hope you remember the term brain inflammation. I hope you can consider that what you’re feeling isn’t a failing on your part, but instead, the way your immune system is telling you there’s a problem that needs to be addressed. And lastly, I hope you remember that despite brain inflammation and all the suffering it can cause, it can be treated and there can be a life of thriving on the other side.
​

Other resources:
  • Mast Cell Activation in Brain Injury, Stress, and Post-Traumatic Stress Disorder and Alzheimer’s Disease Pathogenesis
  • Mast Cells and Neuroinflammation​​ ​

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39 Comments
Dana Holbrook
5/17/2020 07:45:09 pm

Thank you Dr. Snyder for yet another fascinating article! You are truly changing the world for the better through healthcare not "sickcare".

Reply
Courtney Snyder link
5/21/2020 04:59:28 am

Thank you, Dana. I really appreciate that. And thank you, for taking a moment to comment. Courtney

Reply
Brenda Keller Schwieterman
6/1/2020 07:22:14 am

What a wonderful article. I was saddened, yet not shocked, by the part describing how divorces often involve a person(s) with neuroinflammation. I feel as though so many people who struggle to consistently make good choices, suffer from brain inflammation. I've been there myself. It causes so much shame and guilt. I am so very grateful for people like you who share this information, removing my doubts and fears, and realizing with help, there's a way out!

Reply
Courtney Snyder link
6/18/2020 07:12:05 am

Thank you, Brenda. I just saw your comment. I’m so glad you found this helpful.

Reply
Lorelei Glenn
6/2/2020 06:25:19 am

Thank you for another wonderful article- for being more than a doctor but also a teacher! Thank you so much...

Reply
Courtney Snyder link
6/18/2020 07:14:49 am

Lorelei, I just saw your comment - Thank you for saying that. I really do enjoy teaching.

Reply
Meg A Schuler
6/3/2020 12:51:11 pm

Thank you Courtney. You write with such compassion and empathy which provides me with much comfort. As you know, I am so overwhelmed and your article helped me once again understand. Although I am sure I will get confused again and again, I am so glad I can keep going back to reference it. Blessings!

Reply
Courtney Snyder link
6/18/2020 07:20:06 am

Thank you, Meg. I just saw your comment. I’m so glad you found this helpful, and also comforting.

Reply
noreen strauch
8/6/2020 11:45:34 am

Please...Courtney...I am dying and desperate...became light-headed
3 years ago and 40+ doctors are unable to help. Have RA, Hoshi and
now IBS. I supect mcas. Tests have not shed any light on this.
I am not able to tolerate thyroid med and down to 3 foods. Tell me if the combination of sore tummy and light-headed could tell anything.

Reply
Courtney Snyder link
8/9/2020 07:35:12 am

Hi Noreen. When someone has seen multiple specialists without finding answers or relief, mast cell activation is typically at play. While there is testing for it, the testing is very complicated and not very reliable, so many of us will treat presumptively based on symptoms and history (and know if someone is benefitting from treatment or not). I believe when there is suspicion about mast cell activation, there should also be suspicion about mold toxicity or other biotoxins. If you haven’t already, you might consider looking for a functional medicine doctor in your area (or relatively close to your areas) who has experience with treating mast cell activation (and testing for and treating other forms of mold toxicity and other forms of biotoxicity). Know that when it comes to complicated medical illness, there are answers and there is a lot of reason to have hope. Increasingly there are doctors and other practioners out there who are able to identify and treat the underlying root causes, but most of them are going to be describing what they do as functional medicine. You also might find the book, Toxic (By Neil Nathan, MD) that I mentioned in the post, particularly helpful.

Reply
Sandy Roth
10/10/2020 04:19:30 am

Noreen, not sure if you will see my comment here but I am experiencing similar problems to yours that is I have Hashis but I cannot tolerate thyroid meds and have been to dozens of doctors. Wondering if we could communicate separately about what we've been through. My email address is [email protected]. I am desperate for help as I am hypo but trying to take any medicine at all gives me horrible symptoms. Good luck to you.

Reply
Mike
2/10/2021 10:16:31 pm

Jelly legs... oh yeah hate that, happens a few times a month and the crazy munchies come with it. I fit your neural inflammation to a T :). Back pain goes away with quercetin as well as the neural . Love my quercetin. I'll have to try before food. Almost 5 decades before I figured it out and found an MCAS Dr.

Reply
Courtney Snyder, MD link
2/15/2021 06:58:47 am

Thank you, Mike, for your comment. Glad you were able to figure this out. As you know, so many people haven't yet figured this out and sadly never will. Courtney

Reply
Kalyn Sever
3/3/2021 05:34:24 am

Wow, wow, wow! Thank you so much for this article! I felt like I was reading my life story, and it gave me renewed hope. I am curious. I take Vyvanse for Attention Deficit Disorder, and it is somewhat helpful, especially when I take breaks. But I am curious: does Vyvanse have any effect on mast cells, particularly long term? It initially helped amazingly with focus and lessening my impulsivity. But over time, it has become much less effective. I've also gained back all if the weight I initially lost when I started it. I was also prescribed high dose naproxen for migraines, which has been quite helpful. Is this because it is temporarily decreasing inflammation? I have a lot of research ahead of me! Thank you again!!!!

Reply
Courtney Snyder, MD link
3/4/2021 05:51:29 pm

You are very welcome, Kalyn. Yes - naproxen would decrease inflammation, though not necessarily the source of inflammation. I don't believe vyvanse has any any impact on mast cells, but rather is working at the level of neurotransmitters. Chronic inflammation can cause a down regulation of receptors for neurotransmitters such as dopamine, which may explain why a medication could become less effective over time (since it's not addressing inflammation, or the nutrient levels that underly neurotransmitter functioning). I hope you continue to find your answers. Courtney

Reply
Kelly McCormack
4/25/2021 07:08:19 am

Dear Dr. Snyder, I’ve just discovered and read this piece three times now because I’m reading about myself. I feel so validated and seen through your words. Thank you.

Reply
Courtney Snyder link
5/7/2021 05:36:24 am

Thank you, Kelly, for letting me know that. I'm so glad it was meaningful. Wishing you the best on your healing journey. Courtney

Reply
Kim Johnson
1/16/2022 06:38:32 pm

Thank you for this article. My 12 year old son was diagnosed with Mast cells in his GI tract and has multiple body system effects. The neuro is most noticeable lately - lots of stress due to living in a camper since we found mold in our home, preteen hormones, and just his life turning upside down due to food restrictions, Dr appointments etc. This gives me hope as we continue the detoxing process. It's tough.

Reply
Courtney Snyder link
1/18/2022 08:58:11 am

You're welcome, Kim. It is tough. Glad you are finding your way. EMF can become a culprit for many people who have had mold toxicity and it can be the source of some neurologic symptoms. I mention it because as many people try to avoid mold - they are actually making their way into higher EMF environments which starts to create new problems. Thank you for commenting. Best to you and your family. Courtney

Reply
Megan
9/4/2022 05:26:12 pm

Thank you Dr. Snyder for shining a light in such a dark corner for so many of us. I have been on the specialist merry go round for about 4.5 years now. I am diagnosed with hemiplegic migraine, ulcerative colitis and chronic fatigue syndrome. By a fluke they tested my Tryptase which was a 27 and a month later 31.7. My BMB came back normal (1% mast cells reacting to CD117) so no systemic mastocytosis. Does that still mean I could have MCAS? Is there a way to lower your Tryptase or doesn’t it really contribute to how sick you feel. I feel pretty darn sick. Any advice would be appreciated!
Thank you!
Megan

Reply
Courtney B Snyder, MD link
11/22/2022 02:38:35 pm

Thank you, Megan. Mastocytosis is not the same as mast cell activation, so, yes, I would say, you can still have MCAS. Because the testing for MCAS is complicated and has a lot of false negatives, many of us will treat preemptively. The treatment is generally very safe and if someone is benefiting then that would be sufficient to continue. The bigger issue (and one often overlooked in the MCAS community), is why someone is having reactive mast cells. There is usually an underlying factor (often mold toxicity) that when addressed will allow the mast cells to calm down. There are increasingly functional medicine doctors who are knowledgeable in treating mast cell activation and identifying root causes. Best to you on your healing journey.

Reply
Carla
12/17/2022 08:24:24 am

Thank you for such a comprehensive article, Dr. Snyder. Have you had experience using SPMs for inflammation caused by MCA? If so, can the SPMS help not only with joint pain but also with brain inflammation?

Reply
Courtney Snyder, MD link
12/20/2022 02:43:46 pm

Hi Carla,
I don't have experience using SPMs for brain related symptoms. Mostly what I find with a quick look at the research is that they have been used in brain injury and Parkinsons. "SPM's are able to cross the blood-brain barrier, inhibit microglial activation and decrease induced markers of inflammation." ....which suggests that are helpful with brain inflammation. Thanks for the question. Courtney
https://www.frontiersin.org/articles/10.3389/fnagi.2022.780811/full

Reply
Sandy
12/20/2022 07:16:02 pm

Do you ever do consulting in conjunction with general practitioners? I’m in rural Canada with not much access to MCAS specialists or functional medicine doctors. I think my GP might be able and willing to help me based on having someone coach him and me through protocols that have been found to help.

Reply
Courtney B Snyder link
1/10/2023 08:27:28 am

Hi Sandy. I do. One route if for another doctor or practioner to schedule a consultation with me directly. The other is for an individual to schedule and have their doctor on the consultation call. The later allows me to provide them information directly related to the person they are treating.

Reply
Austin Branham
4/3/2023 11:09:38 pm

What I would have done to find this information a year ago. For anyone in a deep/dark place, suffering from mold toxicity - heed the advice and direction shared here. The tremors, relentless panic and anxiety, insomnia and other symptoms are most likely due to MCAS. I speak from first hand experience.

Thank you so much for bringing light and direction for those unknowingly suffering from MCAS and neuroinflammation.

Reply
Courtney Snyder link
6/1/2023 09:51:00 am

Thank you, Austin, for your comments.

Reply
Matt
5/9/2023 10:49:24 am

Lived for 25 years in a house where the floor vents were in the concrete foundation and filled with water when it rained. I think there is mold in my brain.

Reply
Courtney Snyder link
6/1/2023 09:54:18 am

Thank you, Matt, for commenting. I'm sorry to read about your exposure to water damage. I hope you are finding your way to treatment and healing.

Reply
Silke link
10/16/2023 07:16:03 am

Thank you for this free therapy session. I have mcas from birth on, escalated in 2016, diagnosed myself lately at the age of 58. I am on medication now and currently feel my personality and abilities coming back. If improvements last. You gave me so much validation.

Reply
Dan Burke link
2/21/2024 02:12:14 pm

Are there any links between mast cell activation and long COVID? I’ve suffered from long COVID for 2.5 years and have noticed bad flare ups are reduced with claratin. And advice would be appreciated.

Reply
Courtney B Snyder link
3/20/2024 07:47:06 am

We definitely see an association between COVID and mast cell activation. When I see someone with long COVID, I wonder about low zinc as well as biotoxins like mold toxins that may be keeping their immune system dysregulated. I check plasma zinc in anyone with brain symptoms. The range that I use is not the same as a typical lab range. The below link is to a newsletter with the lab ranges that those of us trained with the Walsh Research Institute use. If you have any difficulties accessing it send me an email at [email protected] and I will share it with you. https://courtneysnydermd.substack.com/p/labs-for-evaluating-brain-symptoms

Reply
Amanda
6/24/2024 06:11:05 am

Might low dose naltrexone be helpful for this? I am struggling and need to stabilize things in order to tolerate the mold detox. It seems the adrenals might need support as well. Do you evaluate adrenal function in management of these complex chronic conditions?

Reply
Courtney Snyder MD link
7/16/2024 05:24:48 am

Yes. I do find LDN to also be helpful. I consider adrenal function secondary to the toxicity and find that it often improves with addressing nutrients and toxicity. Depending on severity, it may need it's own assessment and supports. Often, however, mast cell symptoms can cause significant fatigue. If there are other mast cell symptoms then it can be that addressing mast cell activation helps with what looks like adrenal fatigue. Thank you for this question.

Reply
Amanda
6/11/2025 04:37:16 pm

I just read this article again. It is a wonderful explanation of a complicated and under-recognized issue. Thank you for the encouragement this gives to many people, myself included. As I have found I do not tolerate quercetin or luteolin supplements (possibly due to COMT variations?), I wonder what some other options are for natural mast cell stabilization.

Reply
Courtney Snyder link
6/24/2025 01:33:43 pm

Hi Amanda,
I'm glad you found this post useful. If someone is unable to tolerate quercetin (because of a slow COMT), then I will often use cromolyn (not natural). Other tools include LDN , CBD oil, PEA, AllQluer and Mastease a product by Beyond Balance.
Best to you in your healing. Courtney

Reply
Amanda
6/12/2025 05:53:57 am

Benadryl is also anti-cholinergic. I wonder if that could be another factor in why it can be helpful for some people. I think that choline and/or acetylcholine are a piece of the puzzle also. I definitely feel negative effects when I take fish oil or phosphatidylcholine.

Reply
Courtney Snyder link
6/24/2025 01:48:11 pm

Hi Amanda,
That's really interesting. It does seem that choline can contribute to some destabilization of mast cells at least in some people. Thank you for sharing your experience and bringing up this intersection with acetylcholine and choline.
Courtney

Reply
Kay Moore
8/17/2025 04:16:58 am

I have MCAS, try to find all the information I can. Thank you

Reply

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