The difference between hard belly and soft belly lies in the physiological, pathological hard belly and soft belly. In the physiological situation, the belly hard is the belly of the abdominal muscles are relatively well developed, especially the abdominal rectus abdominis, transverse abdominis, medial abdominal muscles, lateral abdominal muscles are relatively well developed, muscle fibers are relatively thick when the belly will appear hard symptoms and feelings. If the abdominal fat layer is relatively thick and muscle layer is relatively thin, it will touch the soft fat, so it will feel soft belly. In addition, in the pathological case of hard belly have the following diseases, such as perforation of the cavity organs, such as gastric perforation, intestinal perforation or subseptal pneumonia, intestinal obstruction, etc., there will be a pathological reaction of hard belly. In the case of a soft belly, pathological causes include simple inflammation in the abdominal cavity.