<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I am experiencing mouth pain, difficulty in swallowing and shortness of breath. What could be the cause of these symptoms?  <response>: I am sorry to tell you this, but these symptoms could be due to esophageal cancer. A tumour in the esophagus can cause difficulty in swallowing and put pressure on other organs, such as the lungs, leading to shortness of breath. The mouth pain could also be a symptom of this disease. 