<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, I have been experiencing some leg pain and ankle swelling for a few days. What could be the reason for this?  <response>: Based on your symptoms, it could be a case of Deep vein thrombosis DVT. It is a blood clot that forms in one or more of the deep veins in the body, usually in the legs. 