Screening Tool
MCAS Quiz
A short observational tool for the multi-system, multi-trigger patterns associated with Mast Cell Activation Syndrome.
20 questions~7 min
Before you begin
This is not medical advice — it is an observational pattern-recognition tool. Your responses stay on this page; nothing is submitted or stored.
The quiz looks for patterns associated with Mast Cell Activation Syndrome (MCAS) — multi-system flares, the characteristic trigger profile (food, heat, chemicals, medications), response to antihistamines, and overlap with POTS, EDS, or post-infection illness.
Answer each question based on what you have actually noticed. If you are unsure, pick the option that comes closest.