<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing weight gain lately, but I havent been eating more than usual. What could be wrong with me?  <response>: Based on your symptoms, it is possible that you have cardiomyopathy. This is a disease of the heart muscle where the heart becomes enlarged and weakened, making it difficult for the heart to pump blood through the body efficiently. Weight gain is a common symptom of this disease. 