Systemic mastocytosis (SM) is a rare disease that occurs when too many mast cells build up in your body.1–4
The signs and symptoms of SM can vary a lot, but the key symptoms include red, flat areas of skin covered in small bumps, anaphylaxis (a severe, potentially life-threatening allergic reaction), bone or muscle pain and passing looser, watery stools.2,3,5,6
Whether you suspect you or a loved one has SM, have been diagnosed with SM or are affected by SM and its impact, this portal will help you and your loved ones as you navigate life with SM together.
