Still trying to figure this out

Never Bet Against Occam: Mast Cell Activation Disease and the Modern Epidemics of Chronic Illness and Medical Complexity

In 2008 Dr. Afrin started coming to understand that a newly recognized type of mast cell disease, now called mast cell activation syndrome (MCAS), was the underlying diagnosis in many patients he was seeing who were each suffering large assortments — quite different from one patient to the next — of chronic multisystem inflammatory illnesses of unclear cause.