01/18/2026
MCAS (Mast Cell Activation Syndrome) is a condition where mast cells (immune cells involved in allergic & inflammatory responses) release “alarm chemicals” like histamine too easily or too intensely — even when there isn’t a true allergy or obvious danger.
This can cause symptoms across many body systems, and it often feels unpredictable, overwhelming, and hard to explain.
Common MCAS symptoms can include:
• flushing, itching, hives
• swelling or “puffy” reactions
• nausea, reflux, abdominal pain, diarrhea
• nasal congestion, coughing, wheezing
• dizziness, lightheadedness, rapid heart rate
• headaches, brain fog, fatigue
• sensitivity to heat, cold, stress, or fragrances
MCAS triggers vary — and can stack:
Your body may tolerate one trigger on a good day…
but multiple triggers can “add up” and cause a flare.
Common triggers include:
• certain foods (especially leftovers/aged/fermented foods)
• heat, hot showers, exercise when unstable
• infections, stress, poor sleep
• alcohol
• fragrances/chemicals
• hormonal shifts (PMS/perimenopause)
What helps most (for many people):
✅ reducing “total trigger load”
✅ a consistent routine (sleep, hydration, meals)
✅ gentle nervous system regulation
✅ individualized medication support when appropriate
✅ a clear flare plan (instead of panic + guessing)
MCAS is real.
And you deserve care that is safe, trauma-informed, and not dismissive
