<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing diminished vision, mouth ulcers, and diarrhea. Do you have any idea what could be causing these symptoms?  <response>: Yes, its possible that you have Behcet disease. Its a rare autoimmune disorder that can cause a wide range of symptoms, including those you have described. I suggest we run some tests to confirm the diagnosis. 