The former is called visceral abdominal pain, often paroxysmal and accompanied by a series of related symptoms such as nausea, vomiting and sweating, abdominal pain is transmitted by visceral nerves; while the latter abdominal pain is transmitted by somatic nerves, so it is called somatic abdominal pain, often persistent and not accompanied by nausea and vomiting. vomiting symptoms. The common causes of acute abdominal pain are as follows: abdominal diseases: 1, peritonitis: caused by gastric and intestinal perforation is the most common. Abdominal pain is characterized by: pain generally located in the site of inflammation, lesions with pressure pain, rebound pain and abdominal muscle tension, intestinal peristaltic sounds weakened or disappeared. 2. Inflammation of abdominal organs: such as acute or chronic gastritis, enteritis, pancreatitis, appendicitis and pelvic inflammatory disease. The general abdominal pain site matches the body projection of the diseased organs. 3, cavernous organ obstruction or dilatation: such as intestinal obstruction, cholelithiasis, biliary ascariasis, urinary tract stone obstruction, etc. The abdominal pain is often paroxysmal and severe colic. 4, organ torsion or rupture: acute torsion such as intestinal torsion, mesenteric or large omental torsion, ovarian cyst torsion, acute visceral rupture such as liver and spleen rupture, ectopic pregnancy rupture, etc. Acute torsion and visceral rupture can cause severe colic or persistent pain. 5, abdominal or organ peritoneal traction. 6.Chemical stimulation: peptic ulcer, stabbing pain or burning pain may occur due to the action of stomach acid. 7, tumor compression and infiltration: mostly seen in the evolving abdominal cavity malignant tumor compression or infiltration of sensory nerves and caused. Involvement pain of thoracic diseases such as pneumonia, angina pectoris, acute myocardial infarction, acute pericarditis, pulmonary infarction, pleurisy, esophageal hiatal hernia, etc., the pain can involve the abdomen, similar to acute abdomen. Abdominal pain is caused by toxin irritation of the abdominal plasma membrane in systemic diseases such as uremia; colic in lead poisoning, and other causes such as gastrointestinal mucosal edema in urticaria and subplasma hemorrhage in the intestinal canal in allergic purpura.