The main symptoms of peritonitis are peritoneal irritation in the early stage, such as abdominal pain, abdominal muscle tension and rebound pain; in the later stage, due to the infection and toxin absorption, the main manifestation is the systemic symptoms of infection and poisoning. 1. Abdominal pain: this is the most important symptom of peritonitis. However, it is usually severe, intolerable and persistent. Deep breathing, coughing, turning the body can aggravate the pain. Therefore, the patient can not change the position, the pain is mostly from the primary focus of the beginning of the spread of inflammation spread to the whole abdomen, but still to the primary lesion site is more significant. 2. Nausea, vomiting: this is a common symptom in the early stage. At the beginning, the peritoneal stimulation causes reflex nausea and vomiting, and the vomit is gastric contents. When paralytic intestinal obstruction occurs in the later stage, the vomit will turn into yellowish green or even brown fecal-like intestinal contents. 3. Fever: the sudden onset of peritonitis can start with normal temperature, and then gradually increase. In elderly and debilitated patients, the temperature does not necessarily rise with increasing illness. The pulse usually increases with temperature. 4. Infectious poisoning: When peritonitis enters the severe stage, there are often high fever, dry mouth, rapid pulse, shallow respiration and other signs of systemic poisoning. In the later stage, due to the absorption of a large number of toxins, the patient is in the expression of indifference, emaciation, sunken eye sockets, cyanosis of lips and mouth, cold limbs, yellow and dry tongue, dry skin, shortness of breath, weak pulse, body temperature rises sharply or falls, blood pressure drops shock, acidosis. 5. Abdominal signs: manifested as weakened or disappeared abdominal breathing, and accompanied by obvious abdominal distension. Pressure pain, rebound pain is the main signs of peritonitis, always present, usually throughout the abdomen and to the site of the primary lesion is the most significant.