- Brynn Duncan has mast cell disease, which causes her to be allergic to almost everything
- Duncan has a feeding tube and is on constant doses of antihistamine
Easley, South Carolina (CNN)The cracker or the bite of ice cream -- Brynn Duncan still isn't sure which one sent her into anaphylactic shock that day. Her food allergies change so frequently, keeping track is almost pointless.
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Scientists don't know yet what causes mast cell disease. Researchers have found mutations in mast cells that may cause the abnormal behavior, but the mutations vary from one patient to the next. Because of this, scientists suspect the mutations are acquired early in life. But genetics may make some children more susceptible to developing the mutations.