<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing some strange symptoms lately. My eyelids are very itchy and I keep biting my nails uncontrollably. Additionally, my wrists have been weak and my shoulders are swollen. Also, I have experienced involuntary urination. What could this be a sign of?  <response>: Based on your symptoms, it sounds like you may have Carcinoid syndrome. It is a rare condition caused by a type of cancer that can cause flushing, diarrhea, and wheezing, but can also cause symptoms like itching, nail biting, and weakness. I recommend we run some tests to confirm the diagnosis and start treatment right away. 