How is my upper abdomen left painful to return a responsibility, also not all the time painful

Upper abdominal pain on the left side is suspected to be a greater possibility of digestive tract diseases, such as acute gastroenteritis, pancreatitis, etc., there may be chronic nephritis or kidney stones caused; usually should ensure that the diet is light nutrition easy to digest, and to the regular hospital digestive internal medicine to do gastroscopy, stool routine examination.