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The carcinoid tumor is a rare type of cancer. It develops in the neuroendocrine system of the body. The neuroendocrine system is responsible for the production of different kinds of hormones. That is why when the person is affected with a carcinoid tumor, he will have symptoms that are due to both the tumor itself as well as hormone imbalances. Carcinoid tumors are usually present in the gastrointestinal system or lungs, but they can also be found in the breast, ovaries, testicles, or kidneys. It usually occurs in people who are over 50 years old.

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1. Flushing

Around 10 percent of the people affected by carcinoid tumor will develop carcinoid syndrome. Carcinoid syndrome occurs when the carcinoid tumor produces different types of hormones. Flushing is one of the symptoms of carcinoid syndrome. About 75 percent of carcinoid tumor patients will experience flushing after exercising, being stressed, drinking alcohol and eating certain foods. However, flushing will gradually start to appear on its own without precipitating factors. The release of histamine may explain the flushing in the carcinoid tumor of the stomach. Histamine is a chemical that causes the blood vessels to become wider, leading more blood to flow to that area. As a consequence, this area will appear red.

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