The stomach should be pressed for several reasons as follows: a. The most common reason is digestive system diseases. Such as acute gastrointestinal perforation when the stomach will be pressed hard, called plate abdomen, acute gastroenteritis when the stomach will also be pressed hard. However, the abdominal pressure in gastroenteritis is not obvious relative to abdominal pain, while the abdomen is hard and painful to press in acute gastrointestinal perforation. Second, general surgery diseases, such as acute diffuse peritonitis, acute appendicitis accompanied by appendiceal perforation, and acute intestinal obstruction, all have clinical symptoms and manifestations of a hard stomach on pressure. Third, urological diseases will also have clinical symptoms of hard abdominal pressure, the most common factor is the stone of renal ureteral stenosis, abdominal pressure right and accompanied by lumbar percussion pain.