Knowing your symptom progression can save a lot of time and energy when you aren’t feeling well. This post outlines the benefits of knowing your symptom progression in a Mast Cell Activation Syndrome (MCAS) Flare.
As an Amazon Associate, I earn from qualifying purchases.
Table of Contents
Who is Betsy Leighton?
I’m a writer, blogger, and healer dedicated to helping individuals reconnect with their innate peace and wholeness by healing nervous system dysregulation. My personal experience with chronic illness called Mast Cell Activation Syndrome (MCAS) shapes my work, and my content offers tools to empower those with chronic illness to improve their well-being and take charge of their health.
I created the Sacred Self-Healing Method and am a trained and certified Safe and Sound Protocol provider, an author, blogger, and A Course in Miracles Teacher. I hold a Master of Divinity in Spiritual Counseling and am a trained spiritual mentor, with certificates in sound healing, aromatherapy, nutrition, and Sacred Deathcare. I offer a self-study certificate program in the Sacred Self-Healing Method, provide spiritual counseling and coaching, courses, and supported subscriptions for the Safe and Sound Protocol.
What is MCAS?
Mast Cell Activation Syndrome (MCAS) is a chronic condition that affects all organ systems. It can cause severe, disabling symptoms every day, including potentially fatal anaphylaxis. MCAS often occurs with other chronic conditions like Ehlers-Danlos Syndrome (EDS) and Postural Orthostatic Tachycardia Syndrome (POTS). Managing MCAS is challenging because many healthcare providers are unaware of it, and diagnostic tests can be unreliable. Treatments include antihistamines and mast cell stabilizers, as well as avoiding triggers. Check out this post on managing MCAS.
What is a symptom progression?
In the context of MCAS (Mast Cell Activation Syndrome), symptom progression refers to how a person’s symptoms change over time—in severity, frequency, triggers, or body systems involved. Because MCAS affects mast cells (which exist in almost every tissue), progression can look different for each person, but it often follows a recognizable pattern:
Typical symptom progression in MCAS
- Initial phase: Symptoms are often intermittent, seemingly random, and triggered by things that don’t bother others—foods, smells, temperature changes, stress, or infections. These may include flushing, itching, GI upset, headaches, lightheadedness, or fatigue.
- Expansion of triggers: Over time, mast cells may become more reactive. People often notice increasing sensitivity to foods, medications, chemicals, or environmental factors.
- Multi-system involvement: Symptoms begin to appear in additional body systems—skin, GI, cardiovascular, neurological, respiratory—because mast cells exist everywhere. This can make the symptom picture feel confusing or inconsistent.
- Heightened severity or frequency: Episodes (or “flares”) may become more intense or more frequent. Instead of occasional flares, symptoms may become daily or near-daily if left untreated.
- Secondary conditions co-emerge: MCAS progression often overlaps with dysautonomia/POTS, EDS-related issues, increased histamine intolerance, or functional GI disorders because mast-cell instability affects connective tissue, nerves, and vasculature.
Important context
- Progression is not inevitable—many people stabilize significantly with treatment (H1/H2 blockers, mast-cell stabilizers, low-histamine diet, trigger avoidance, etc.).
- Symptom progression is often nonlinear: people have flares and remissions.
- Stress, infections, hormones, mold exposure, or significant life events can accelerate progression.
What is a typical symptom progression?
Phase 1 — Early, Intermittent Sensitivity
Often begins months or years before MCAS is recognized.
- Occasional flushing, itching, or rashes
- Sudden reactions to certain foods (wine, leftovers, fermented foods)
- “Random” hives or swelling
- Intermittent GI issues: bloating, nausea, diarrhea, cramping
- Headaches or “hangover-y” feelings after minor triggers
- Heightened smell or chemical sensitivity
- Episodes resolve without treatment
Pattern: symptoms seem unrelated, sporadic, and easy to brush off.
Phase 2 — Patterns Begin to Emerge
Triggers become more consistent.
- More foods cause reactions (especially histamine-rich ones)
- Increased sensitivity to fragrances, cleaners, or temperature changes
- More frequent GI or dermatologic reactions
- Rising fatigue or “wired but tired” feeling
- Getting sick more easily or taking longer to recover
- First hints of dizziness or orthostatic intolerance
Pattern: “Why does my body react to everything now?”
Phase 3 — Multi-System Involvement
This is often the phase where people start seeking help.
- Cardiovascular: palpitations, drops in blood pressure, tachycardia
- Neurological: brain fog, anxiety spikes, sensory overload, insomnia
- Respiratory: throat tightness, shortness of breath, “air hunger”
- GI intensifies: food intolerances, reflux, gastritis-like symptoms
- Dermatologic flares become more frequent
- Extremes of temperature or stress can trigger reactions
Pattern: Symptoms feel systemic because mast cells exist everywhere.
Phase 4 — Larger Flares & Co-Conditions
Commonly triggered by:
- infection
- major stress
- surgery
- mold exposure
- hormonal shifts
- trauma
- medication reactions
New conditions may surface or worsen:
- POTS/dysautonomia
- Ehlers-Danlos–related issues
- Chronic migraine
- IBS/functional GI disorders
- Chemical sensitivity
- Reactive hypoglycemia or cortisol issues
- Histamine intolerance
Pattern: The “perfect storm” period—reactivity spikes and becomes less predictable.
Phase 5 — Stabilization (With Treatment)
With MCAS interventions, many people significantly improve:
- H1/H2 blockers
- Mast-cell stabilizers (cromolyn, quercetin, ketotifen)
- Low-histamine or low-reactivity diet
- Sleep and stress regulation
- Avoiding known triggers
- Addressing mold or chronic infections
- Treating POTS/dysautonomia if present
Symptoms become:
- less frequent
- less intense
- more predictable
- more manageable
Pattern: Capacity gradually returns as mast cells “calm down.”
What Makes Each MCAS Progression Unique
- It’s not a straight line.
- People cycle through flares and remission periods.
- Different systems can flare up at other times.
- Life stressors and exposures heavily influence progression.
- With proper management, many people improve dramatically.
My symptom progression
A level one symptom flare starts with a sudden sense of dysphoria, neuropathy in my vagus nerve, and facial flushing. I may not even notice that I am flushed unless I look in the mirror, and then I have that “aha!” moment, and I know I am starting to react to something.
At level two, I typically experience hives on my limbs, spreading to my torso. Then general inflammation increases, and I develop a sense of heaviness throughout my body from excess fluid and stiffness.
At level three, I begin to experience neurological pain and numbness in my sciatic nerve, which comes in waves at night, waking me up. Or if it happens during the day, they are accompanied by waves of intense heat.
If my symptom flare continues to progress to level four, I start to develop body aches, chills, and flu-like symptoms. Or I could develop mental and emotional symptoms of anxiety, panic, depression, or overwhelm.
And in a level five symptom flare, all of these symptoms are layered on top of one another, involving multiple body systems, and causing a self-propagating cycle of mast cell activation.
The bucket theory
The bucket theory simplifies understanding symptom reactions with MCAS. Imagine your body as an empty bucket you don’t want to overflow. Reactions to various stimuli fill the histamine bucket at different rates, forming the total histamine level (how full your bucket is). More histamine means more symptoms. By managing triggers, reducing exposures, and taking medications and supplements, you can control your bucket’s level.
Know your typical symptom progression
Understanding your symptom progression during a flare is key to developing your rescue plan. This post discusses how to recognize symptom progression so you can be prepared to address them.
Get my free ebook, symptom log, and meal plan!
Want a tool to easily track your symptoms?
What is your symptom progression?
I can’t tell you how many times I have been uncomfortable but not realized I was having an MCAS symptom flare until it was well underway. Just today I was experiencing itchiness and it didn’t occur to me that I was having a flare until I went to the bathroom and saw my face in the mirror. My face was flushed bright red, and the itchiness under my arm that I had been scratching for a couple of hours was red and angry-looking.
Because facial flushing is usually my first symptom, when I remember to check my face at the onset of anything strange, I am grateful to know what is going on. It doesn’t stop the symptoms, but it gives me the peace of mind that I know where I am in my symptom progression, and I can begin following my rescue plan. Check out this post about Rescue Plans.
My classic symptom progression
My symptom flares usually start with facial flushing. I may not even notice that I am flushed unless I look in the mirror, and then I have that “aha!” moment, and I know I am starting to react to something.
Then I will experience prickling or pain in my limbs, spreading to more of my body.
Then general inflammation increases, and I develop a sense of heaviness throughout my body from excess fluid and stiffness.
Then I begin to experience neurological pain/numbness in my sciatic nerve, which comes in waves at night, waking me up. When they happen during the day they are accompanied by waves of intense heat.
If my symptom flare continues to progress, I will start to develop body aches, chills, and flu-like symptoms. Or they could develop into mental/emotional symptoms of anxiety/panic or depression/overwhelm.
At any time throughout my symptom progression, I may experience insomnia, heart palpitations, GI upset such as bloating, gas, heartburn/reflux, constipation, and a sense of fullness/constriction in my throat with hoarseness.
And if the mast cell flare goes unchecked for a few days, then my hair loss dramatically increases, I get migraines of all kinds, including ocular and hemiplegic migraines.
You need to know your own symptom progression
Sometimes it is hard to know what is an MCAS symptom, and what is just something weird that you are experiencing. In the beginning, it can be especially hard. I offer my sample progression above as an example of how it could go. But your symptom progression will be uniquely yours.
What helped me in the early months of my MCAS diagnosis was joining Facebook groups focused on MCAS and searching for symptoms I was experiencing. I realized that just about any symptom could be related to my MCAS. By reading about other people’s symptoms and what caused them I pieced together my symptom progression.
Check out these circadian health tools!
I’m an affiliate with Bon Charge, a company that makes tools for circadian health, and you can receive 15% off your order with my coupon code BETSYL.
Bon Charge offers tools such as yellow– and red-tone blue-blocking glasses, red light therapy devices, PEMF mats, infrared saunas, and EMF-blocking products.
Sign up for the SSP!
I’ve found the Safe and Sound Protocol (SSP) to be the most helpful bottom-up healing strategy if your nervous system has been overloaded with toxic exposures, including mold or non-native EMFs, chronic infections, concussions, stress, or trauma. The SSP is a passive listening therapy based on Polyvagal Theory that helps heal nervous system dysregulation. Many people with MCAS and other chronic conditions have nervous system dysregulation stemming from infections, toxic exposures, concussions, and trauma. The SSP is an easy-to-use app that lets you listen to specially filtered music for 30 minutes each day as part of a 5-hour cycle. Studies show the SSP has a profound effect on mental health and chronic conditions. Here’s a short podcast describing the Safe and Sound Protocol.
You can sign up for the SSP here!
Heal your mind!
While the SSP is a bottom-up, somatic therapy for healing the nervous system, the Sacred Self-Healing Method I offer is a top-down nervous system-healing modality that focuses on cognition, attention, perception, and emotion, using the mind’s higher functions. The SSP and the Sacred Self-Healing Method complement each other and together produce lasting results. Here’s a short podcast on my self-healing practice.
I provide one-on-one in-person and remote chronic illness and caregiver coaching, as well as Sacred Self-Healing Sessions based on the Sacred Self-Healing Method, a proven, novel co-creative healing modality detailed in my Books.
Order my books!
Here’s a short podcast highlighting my five books.
My latest book, Living In The Light: Healing with Forgiveness, Sound, and Light, is all about the tools that have been most helpful for me to heal: forgiveness, sound, through nervous system retraining using the Safe and Sound Protocol, and light, through entraining my circadian rhythm with the energy of the sun. Living In The Light is available here!
Rocks and Roots chronicles my solo backpacking journey on the Superior Hiking Trail and my efforts to overcome nervous system dysregulation, gut dysbiosis, and Mast Cell Activation Syndrome symptoms to complete the 328-mile hike successfully.
The Sacred Self-Healing Method ebook is available here and in most ebook retailers!
The Sacred Self-Healing Workbook is available for purchase here!
Betsy’s first book, Sacred Self-Healing: Finding Peace Through Forgiveness, is available here
Companion Recordings
The companion audio recordings of chants, guided meditations, and sound healing demonstrations that accompany the Sacred Self-Healing Method are available for free on my YouTube channel here
What do you think?
I’d love to have your reply below!
Disclaimer
The preceding material does not constitute medical advice. This information is for information purposes only and is not intended to be a substitute for professional medical advice, diagnosis, cure, or treatment.
