If you live with Mast Cell Activation Syndrome (MCAS), you know the script by heart.
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The flushing, the hives, the foods you can no longer eat, the racing heart, the reactions that come out of nowhere, and the specialists who shrug because your labs look "normal."
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Maybe you've been told it's just allergies. Maybe you've been told it's anxiety. Meanwhile your list of safe foods keeps shrinking and your world keeps getting smaller.
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We see MCAS for what it is: a real, physical, multi-system condition. At Neuroveda Health, mast cell activation is a core specialty, not a curiosity. We take the time, do the testing, and treat the whole picture: immune system, nervous system, gut, and all.
Seattle clinic with telehealth options for Washington State. We also collaborate with your existing allergist, immunologist, or primary care team.
What is Mast Cell Activation Syndrome (MCAS)?
Mast Cell Activation Syndrome (MCAS) is a condition in which mast cells - immune cells stationed throughout the body - release their chemical mediators too easily, too often, and at the wrong times. Because those mediators (histamine and hundreds of others) act on skin, gut, blood vessels, lungs, and nerves, MCAS causes recurring allergy-like and inflammatory symptoms across many organ systems at once.
That multi-system pattern is exactly why MCAS is so often missed. Each symptom on its own looks minor or gets referred to a different specialist: the dermatologist for hives, the gastroenterologist for nausea, the cardiologist for the racing heart. No one connects the dots. That's the part we do differently.
Common signs of MCAS
If several of these describe your daily life, especially if they come and go in flares, you're in the right place:
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Flushing, hives, itching, or skin that reacts to pressure, heat, or friction.
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Food reactions and intolerances that keep multiplying, often without positive allergy tests.
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Nausea, cramping, bloating, diarrhea, or reflux that flares unpredictably.
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A racing heart, lightheadedness, or blood pressure swings (often overlapping with POTS).
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Nasal congestion, throat tightness, wheezing, or chemical and fragrance sensitivity.
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Brain fog, headaches, anxiety-like surges, or feeling "poisoned" after eating.
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Reactions to medications, supplements, heat, exercise, stress, or hormonal shifts.
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And episodes that resemble anaphylaxis, with or without a clear trigger.
MCAS rarely travels alone. We treat the whole cluster.
Mast cell activation is famous for keeping company. It so often appears alongside hypermobility and dysautonomia that the three are sometimes called a triad, and untangling them is exactly the kind of complexity Neuroveda Health was built for.
POTS and dysautonomia show up because mast cell mediators act directly on blood vessels and the autonomic nervous system, and POTS frequently co-occurs with MCAS. We offer complete in-office autonomic nervous system testing, one of only three locations in Washington State with the full four-test evaluation.
Gut dysfunction and SIBO matter because the gut holds one of the body's densest mast cell populations, and overgrowth, motility problems, and food intolerances both trigger and result from mast cell activation, which we evaluate with comprehensive gut and SIBO testing.
Long COVID and post-viral illness can push already-reactive mast cells into persistent overdrive.
Hypermobility and Ehlers-Danlos (hEDS/HSD) commonly occur together with MCAS through shared connective tissue and immune overactivity; treating one without the other leaves results on the table.
Mold and biotoxin illness is one of the most under-recognized drivers of chronic mast cell activation, particularly after time in a water-damaged building, so we test for mycotoxin burden and nasal colonization (MARCONS) when the history fits.
And small fiber neuropathy - burning, tingling, and autonomic symptoms from nerve involvement that standard studies miss - is evaluated with a simple in-office skin biopsy.
Most clinics hand each of these to a different specialist. We build one coordinated plan that treats the cluster as what it is: one connected story.
How we diagnose MCAS
There is no single yes-or-no test for MCAS, which is exactly why so many patients go years without answers. Diagnosis takes a clinician who knows the condition well: someone who recognizes the pattern, times the testing correctly, and rules out look-alikes. Getting it right changes everything - it validates your experience and opens the door to treatment that actually works.
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Our evaluation starts the way all care at Neuroveda starts: with a real conversation about your whole history. Then we layer in testing strategically - the fewest tests that illuminate the most meaningful answers.
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Pattern-based clinical evaluation - mapping your symptoms, flares, and triggers against established MCAS criteria: recurrent multi-system symptoms consistent with mast cell mediator release, supporting lab evidence, and response to mast-cell-directed treatment
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Mast cell mediator testing - targeted lab work such as serum tryptase and urinary mediator metabolites, timed around flares when possible, because timing and handling make or break these tests
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Autonomic nervous system (ANS) testing - tilt table, heart rate deep breathing, Valsalva, and QSART - to diagnose the POTS and dysautonomia that so often ride along with MCAS
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Gut, mold, and infection workup - SIBO breath testing, comprehensive microbiome panels, urine mycotoxin testing, and MARCONS nasal swab when your history points to an underlying driver, drawn from our full specialty testing menu
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Skin biopsy for small fiber neuropathy - a 30-minute in-office procedure that detects nerve involvement standard studies can't see
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You don't need to arrive with a diagnosis. You don't need to have figured anything out. That's our job - together.
Integrative treatment for Mast Cell Activation Syndrome
MCAS is treatable. Not with a single pill, but with a layered, personalized plan that quiets overactive mast cells, removes what's provoking them, and retrains the systems that keep them on high alert.
Our approach blends evidence-based modern medicine with Ayurvedic and Chinese medicine tradition, and because every reactive body is different, every plan is built for yours.
Calm:
quieting overactive mast cells
The first priority is lowering your baseline reactivity so you can function, eat, and sleep again.
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Medication management - thoughtfully sequenced H1 and H2 antihistamines, mast cell stabilizers, and related therapies, introduced carefully because we know reactive patients react to medications too
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Natural mast cell stabilizers - evidence-informed options such as quercetin and other botanical and nutrient support, matched to what you tolerate
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Trigger mapping and low-histamine diet guidance - a structured, supported approach to identifying your real triggers, using therapeutic diets as a tool rather than a life sentence; the goal is always to expand your world again, not shrink it
Uncover:
treating what's driving the activation
Mast cells rarely misbehave without a reason. When we find and treat the driver, the whole picture can shift.
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Gut restoration - treating SIBO, dysbiosis, and motility problems that keep gut mast cells inflamed
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Mold and biotoxin treatment - binders, antifungal strategies, and environmental guidance when mycotoxin testing points to exposure
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Infection and immune evaluation - addressing chronic infections and immune dysregulation that keep the system stuck in defense mode
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Hormone balance - because hormonal shifts are a common and under-appreciated mast cell trigger
Regulate:
calming a nervous system stuck on high alert
Mast cells and the nervous system talk to each other constantly: stress and threat signals degranulate mast cells, and mast cell mediators feed back into anxiety, insomnia, and autonomic chaos. Breaking that loop is central to lasting improvement.
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Acupuncture & Chinese herbal medicine for system-wide balance, sleep, and stress physiology
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IV therapy for hydration and nutrient support, carefully personalized for reactive patients and especially valuable when POTS is part of the picture
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Therapeutic Plasma Exchange (TPE) for select patients with significant immune-driven illness - MCAS is among the conditions treated in our TPE program, at Seattle's longest-running private TPE clinic
Care from people who truly get it.
MCAS care at Neuroveda is provided by a team that treats mast cell activation and its companion conditions every day, and understands how much skill it takes to treat a body that reacts to treatment itself.
ND, LAc
is a naturopathic physician and acupuncturist specializing in MCAS and immune dysregulation, hypermobility spectrum disorders (HSD/EDS), craniocervical instability, and dysautonomia. Dr. Squires also heads our Therapeutic Plasma Exchange (TPE) program.
is a Stanford-trained, board-certified family physician providing complex chronic care management for MCAS, EDS, POTS, and long COVID, alongside myofascial pain treatment and mental health support.
PA-C, FNTP, MMS
treats MCAS, POTS, and hEDS through a functional medicine lens, with deep expertise in gastrointestinal disorders, hormones, and the nutritional side of histamine and mast cell reactivity.
DMSc, PA-C, ATC
brings extensive experience treating MCAS, hypermobility and EDS, dysautonomia, and POTS, and as a person living with hEDS herself, her lived experience shapes how our whole program cares for reactive, complex patients.
LMFTA, MA Psyc, LMT
provides trauma-informed Fascial Counterstrain for POTS, chronic pain, and the emotional weight of chronic illness.
Behind them stands our full integrative team: functional medicine, Ayurveda, Chinese medicine, and integrative neurology. Because complex conditions deserve more than one set of eyes.
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“I am getting better care than I ever had in my 25 years of chronic pain, and I have been able to acquire the necessary testing to figure out my way forward.”
What your first visit looks like
Connect.
Fill out our inquiry form and tell us your story. We'll match you with the right provider and confirm scheduling and pricing up front.
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Deep-dive consultation.
Your initial visit is a real evaluation - your whole history, your flares and triggers, what you've tried, and what questions most need answering. No 12-minute appointments here.
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A personalized plan.
Every first visit ends with a collaboratively-determined assessment and treatment plan - testing to pursue, treatments to begin, and a clear path forward. You stay in the driver's seat.
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We see patients in person at our Seattle clinic and via telehealth for Washington State residents. Many patients travel to us for evaluation and testing, then continue much of their care from home.
Frequently asked questions about MCAS treatment
How is MCAS diagnosed?
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MCAS is diagnosed through a combination of three things: recurrent symptoms in two or more organ systems consistent with mast cell mediator release, laboratory evidence of mediator elevation (such as serum tryptase or urinary mediator metabolites, ideally measured around a flare), and improvement with mast-cell-directed treatment. Because mediator tests are timing-sensitive and frequently normal between flares, a normal lab result does not rule MCAS out, which is why experienced clinical evaluation matters so much.
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Is MCAS a real condition, or is it all in my head?
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MCAS is a real, physiologic condition recognized in the medical literature, with published diagnostic criteria. It is also commonly dismissed, because its symptoms span many organ systems and standard labs often look normal. If you've been told it's anxiety while your body keeps reacting, you deserve an evaluation from clinicians who work with mast cell disease every day.
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What's the difference between MCAS and allergies?
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In a classic allergy, mast cells react to a specific substance through a specific antibody (IgE), and allergy testing can usually identify the culprit. In MCAS, the mast cells themselves are overreactive - they release mediators in response to many different triggers, or seemingly none at all, which is why allergy panels often come back negative even though your reactions are very real.
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What's the difference between MCAS and histamine intolerance?
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Histamine intolerance is primarily a problem of clearing histamine - the body can't break down what comes in through food and normal metabolism, so histamine accumulates. MCAS is a problem of production - mast cells release too much histamine (plus many other mediators) too easily. The two can look similar and can coexist, but they're treated differently, and sorting out which one you have is part of our evaluation.
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Do you treat MCAS along with POTS and hEDS?
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Yes, and we'd argue you can't properly treat one without checking for the others. MCAS, POTS, and hypermobile EDS travel together so often they're sometimes called a triad. We offer complete in-office autonomic testing to diagnose POTS, clinical evaluation for hypermobility, and one coordinated plan that treats the whole cluster rather than referring each piece to a different specialist.
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Can MCAS be cured?
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There's no permanent cure for MCAS, but it is very treatable, and many patients improve dramatically. Stabilizing mast cells, identifying and removing drivers like SIBO or mold exposure, and calming the nervous system loop that keeps mast cells on high alert can restore foods, activities, and stability that felt lost for good. The goal is a bigger life, not a longer restriction list.
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Do I need a diagnosis before booking?
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No. Many of our patients come to us suspecting MCAS without a formal diagnosis, or with reactions nobody has explained. Evaluation is part of what we do. If you already have a diagnosis, we'll build on it rather than starting from scratch, and we're happy to work alongside your existing allergist, immunologist, or primary care provider.
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Do you offer telehealth for MCAS care?
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Yes. We're licensed to treat patients located in Washington State, with telehealth available pending provider availability. In-office services like autonomic testing, skin biopsy, IV therapy, and TPE take place at our Seattle clinic, and many patients combine periodic in-person visits with telehealth follow-up.
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Will insurance cover my care?
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Neuroveda is a direct-pay clinic; we provide Superbills and billing codes so you can seek reimbursement from your insurer. Some components, like skin biopsy pathology, are frequently covered by insurance. We keep pricing transparent so you can plan ahead; provider rates are listed on each provider's page.
You deserve care that connects the dots
You've spent enough time carrying a folder of normal labs while your body keeps sounding alarms. Whether you're newly suspicious that mast cells explain your reactions, or you're years into an MCAS diagnosis and need a team that can treat the whole cluster, we're here for all of it. We're here for you.