A gastrointestinal carcinoid tumor is cancer that forms in the lining of the gastrointestinal tract... The gastrointestinal tract includes the stomach, small intestine, and large intestine... These organs are branch of the digestive system, which processes vitamins, minerals, carbohydrates, fats, proteins, and water in foods that are eaten and helps pass devastate material out of the body... Gastrointestinal carcinoid tumors build up from a certain type of hormone-making cell in the lining of the gastrointestinal tract... These cells create hormones that help regulate digestive juices and the muscles used in moving food through the stomach and intestines... A gastrointestinal carcinoid tumor may also produce hormones. Carcinoid tumors that start in the rectum usually do not produce hormones....

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