# MCAS ‘starter pack’
What is MCAS?
Section in progress. Also, see comments section on this page for several graphics on MCAS symptoms.
DISCLAIMER: I am a layperson and person with MCAS, not a doctor, and am not qualified to give medical advice. The following are things I have found through my own research and experience. Individuals' experiences may vary and efforts should always be made to find trained medical professionals to manage MCAS care.
MCAS, "Mast Cell Activation Syndrome", is (put simply) a medical issue where part of the immune system (mast cells) are 'overreactive' and cause histamine and other inflammatory processes to fire excessively, causing a host of multi-system symptoms from brain for to GI issues to fatigue to skin issues to breathing issues ... and so on (symptom list and diagrams are availble at the botton of this page). Although MCAS is estimated by researchers to affect as much as 10-14% of the population, the syndrome was only named 5 years ago and the overwhelming maj