<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been noticing blood in my stool and rectal bleeding for the past few days. Can you tell me whats happening?  <response>: Based on your symptoms, it sounds like you may have ulcerative colitis. This is a chronic disease that causes inflammation and ulcers in the lining of the colon and rectum, resulting in bleeding during bowel movements. 