Mast cell activation syndrome, or disease (MCAS), is a condition that causes mast cells to release these substances too frequently, resulting in severe allergic reactions. After detecting an ...

and lonely symptoms of POTS,” Knowles wrote. According to US Magazine, Knowles also revealed she was previously diagnosed with Sjögren’s syndrome and mast cell activation syndrome (MCAS ...

may be used to prevent mast cell activation and the subsequent release of inflammatory mediators. Topical or oral ...