Most people who experience carcinoid syndrome have an advanced cancer that has spread to the liver.

CNN: Carcinoid syndrome

Only a small percentage of carcinoid tumors secrete the chemicals that cause carcinoid syndrome.

CNN: Carcinoid syndrome

Dr. Marybeth Hughes and the carcinoid surgical team completed the surgery in about two hours.

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Carcinoid tumors occur most commonly in your gastrointestinal tract, including your stomach, small intestine, appendix, colon and rectum, or in your lungs.

CNN: Carcinoid syndrome

Some carcinoid tumors don't have to be advanced to cause carcinoid syndrome.

CNN: Carcinoid syndrome

"The two different types have fairly dramatically different clinical behaviors, " said Matthew Kulke, director of the carcinoid and pancreatic neuroendocrine tumor program at the Harvard-affiliated Dana-Farber Cancer Institute in Boston.

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What causes carcinoid tumors is unclear.

CNN: Carcinoid syndrome