<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing changes in my stool appearance, as well as alternating bouts of constipation and diarrhea. What could be causing this?  <response>: Based on your symptoms, it is possible that you have a rectal disorder, such as irritable bowel syndrome or inflammatory bowel disease. I would recommend further evaluation and testing to determine the underlying cause and appropriate treatment. 