<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing abdominal pain, diarrhea, and blood in my stool. I am also constantly tired and fatigued.  <response>: Based on your symptoms, its possible that you have ulcerative colitis. We will need to perform a series of medical tests to confirm your diagnosis. These include a blood test, CBC, sigmoidoscopy or colonoscopy, glucose measurement, IV fluid replacement, electrolyte panel, and a CT scan. 