Carcinoid tumors develop from hormone producing cells of the neuroendocrine system. They usually originate in the digestive tract or lungs but can also rarely occur in the pancreas, testicles or ovaries. Carcinoid tumors growth tends to be slow compared to other malignant tumors but they do have the potential to metastasize. Symptoms depend on location and size of the tumor, if the tumor is in the digestive system the symptoms are gastrointestinal tract issues and if the carcinoid tumor is in the lungs then breathing issues become symptomatic. As the tumor has developed from hormone producing cells other symptoms can be due to excess release of hormones including facial flushing, diarrhea, wheezing, skin problems and peripheral edema.
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