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Carcinoid tumors are tumors that secrete excessive amounts of the hormone serotonin .
Serotonin is converted by the body to 5-HIAA . The precursor to serotonin is tryptophan , an amino acid that is also used by the body to manufacture niacin and certain proteins . In children, carcinoid usually occurs in the appendix and removal of the appendix results in a complete cure. The information provided herein should not be used for diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions.