ON THIS PAGE: You will find some basic information about this disorder, which may or may not become cancerous, and the parts of the body it may affect. This is the first page of Cancer.Net’s Guide to Mastocytosis. To see other pages, use the menu on the side of your screen. Think of that menu as a roadmap to this full guide.
Mast cells are a type of blood cell made in the bone marrow. They are involved in allergic reactions and help fight off parasitic infections. Mast cells produce histamine, a chemical that can cause itching, sneezing, congestion, swelling, and wheezing.