<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing hand stiffness, decreased heart rate and excessive appetite, what could be wrong with me?  <response>: Based on your symptoms, its possible that you have a congenital heart defect. Its a condition in which the heart didnt develop properly before birth, causing various symptoms including those youve described. You should get a proper diagnosis and treatment from a cardiologist. 