ON THIS PAGE: You will find information about the number of people who are diagnosed with mastocytosis each year. Use the menu to see other pages.
Mastocytosis is a rare disorder, and its true incidence rates are unknown. Mastocytosis affects males and females in equal numbers and can begin during childhood or adulthood. Childhood-onset disease usually occurs before a child turns 2 years old.
Source: National Organization for Rare Disorders.
The next section in this guide is Risk Factors. It explains what factors may increase the chance of developing this disease. You may use the menu to choose a different section to read in this guide.