<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, Ive been experiencing some pain in my arm and hand, and I noticed that my arm is swollen. Do you know what could be causing this?  <response>: Based on your symptoms, it sounds like you may have an injury to your arm, possibly a sprain or a fracture. I recommend you come in for an examination and an X-ray to determine the extent of the injury. 