A large and hard stomach may be caused by the following: 1, ascites, usually chronic hepatitis, which gradually develops into cirrhosis or hepatocellular carcinoma, the formation of ascites, in addition to a large stomach, there will also be a yellowing of the skin of the whole body or other more serious symptoms. 2, peritonitis, commonly caused by traumatic rupture of the liver and spleen bleeding or digestive perforation, stimulation of peritoneum leading to peritoneal tension of abdominal muscles, accompanied by localized pressure pain and rebound pain. 3, intestinal obstruction, common is the weakening of intestinal peristalsis or intestinal obstruction caused by the anus to stop defecation, resulting in abdominal bulging, abdominal muscle tension can be felt when pressed and pressure pain.