Carcinoid tumors are typically cancerous. These slow-growing tumors are often found in the gut or the lungs years after they first develop. They can spread to other parts of the body. Carcinoid tumors ...

Carcinoid syndrome affects certain people who have neuroendocrine tumors (NETs). Carcinoid syndrome can occur when an NET secretes hormones into the bloodstream. This can cause symptoms such as facial ...