Chronic peritonitis can be diagnosed through the doctor’s examination, laboratory tests, imaging tests, etc., after a comprehensive judgment, if necessary, can also be carried out abdominal puncture and laparoscopy. 1. Symptoms: patients with abdominal pain is one of the main symptoms of chronic peritonitis, often manifested as persistent severe pain in the abdomen, but the degree of pain in the clinical patients often vary in severity. It can also be accompanied by toxic shock, nausea, vomiting and other manifestations. 2. Physical examination: usually when the doctor carries out physical examination, the patient will often appear abdominal pressure pain, rebound pain, abdominal muscle tension and other symptoms. 3. Laboratory tests: routine blood tests often show elevated white blood cell counts, elevated neutrophil percentages, etc., and patients may also have elevated C-reactive protein. If the patient has bacterial infection, calcitonin may also be elevated. 4. Imaging examination: Generally, patients can undergo ultrasonography, which is conducive to clarifying the cause of the disease, and patients also need to be matched with abdominal standing plain film and CT examination, which are helpful in diagnosing the disease. Among them, CT examination can also be helpful to the abdominal cavity substantial organ lesions. It is recommended that after the diagnosis of chronic peritonitis, patients need to be hospitalized and treated promptly as prescribed by the doctor.