According to the mechanism of abdominal pain, abdominal pain can be categorized into visceral abdominal pain, somatic abdominal pain and involving pain. 1. Visceral abdominal pain: it is the abdominal pain that occurs in the abdominal cavity organs, mainly caused by the pain sensation by the specific nerve conduction to the internal organs. The pain is characterized by unclear pain site, unclear pain sensation, often accompanied by nausea, vomiting, sweating and other symptoms of autonomic arousal. 2. Somatic abdominal pain: pain signals from the peritoneal wall layer and the abdominal wall are reflected to an exact site through specific nerves, and the pain is characterized by a more intense pain, a clear pain site, a longer duration, and local abdominal muscle tonus. 3. Involuntary pain: the pain of the abdominal organs through the visceral nerve afferent, projected to the surface of the corresponding parts of the body caused by the pain is characterized by the degree of abdominal pain is severe, abdominal pain in a clear area, accompanied by the corresponding parts of the pressure and sensory hypersensitivity, and so on. When abdominal pain occurs, it is recommended to go to the hospital.