<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been having melena, rectal bleeding, burning abdominal pain and diarrhea. What could be the reason for this?  <response>: Based on your symptoms, its possible that youre suffering from ischemia of the bowel. Its a condition where there is insufficient blood flow to the intestines, which can cause these symptoms. Note: Its important to note that this conversation is just for informative purposes and its important to seek professional medical advice and treatment from a qualified healthcare provider. 