Definition
By Mayo Clinic staffCarcinoid syndrome occurs when a rare cancerous tumor called a carcinoid tumor secretes certain chemicals into your bloodstream, causing a variety of signs and symptoms. Carcinoid tumors occur most commonly in the gastrointestinal tract or lungs.
Because carcinoid tumors generally grow slowly, you typically wouldn't experience carcinoid syndrome until the tumors are quite advanced. You might discover you have carcinoid cancer through a test for an unrelated disease or condition.
Treatment for carcinoid syndrome usually involves treating the cancer. However, because most carcinoid tumors don't cause carcinoid syndrome until they're advanced, a cure may not be possible. In those cases, medications may relieve your symptoms of carcinoid syndrome and make you more comfortable.
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