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Carcinoid tumors are rare, with incidence estimated at less than 3 per 100,000 people. The most common sites of disease are the gastrointestinal tract or lung, but they can occur in many parts of the body. Some carcinoid tumors produce hormones such as
serotonin and bradykinin which may cause symptoms such as flushing or diarrhea.
See also Gastrointestinal Carcinoid Tumour
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