Gastrointestinal carcinoid tumors develop from a specialized cell in the lining of the GI tract that produces hormones that regulate digestive enzymes and peristalsis, the contraction of muscles that moves food through the intestines. Gastrointestinal carcinoids are slow-growing tumors that most often develop in the appendix, small intestine and rectum.
No symptoms in early stage, but if the tumor has reached the liver or other parts of the body, the following symptoms may occur:
- Redness or a feeling of warmth in the face and neck
- Shortness of breath, fast heartbeat
- Swelling in the feet and ankles
- Pain or a feeling of abdominal fullness