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, this portal will help you and your loved ones as you navigate life with SM together.
