<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing constipation, upper abdominal pain, nausea, and a loss of sensation in my stomach. What could be causing these symptoms?  <response>: Based on your symptoms, it sounds like you may be experiencing gastroparesis, a condition where the muscles in your stomach do not work properly and cause delayed emptying of food from your stomach into your small intestine. 