Complications of patients with peritoneal cancer include ascites, intestinal torsion, intussusception, etc. Due to the different situations of individuals, specifics need to be combined with their own situations and be judged comprehensively. Peritoneal cancer is a kind of malignant tumor occurring in peritoneum, which can be secondary to other malignant tumors, such as gastric cancer, colorectal cancer, ovarian cancer and so on. A few patients belong to primary peritoneal carcinomatosis, and the etiology of primary is not yet clear, which may be caused by malignant transformation of residual tissues on the malignant migration path of embryonic gonadal cells. The common complication of peritoneal cancer is ascites, which usually indicates that the disease is in advanced stage. Or the tumor invades the gastrointestinal tract, and the mass will cause intestinal torsion and intussusception, etc., and the patient may suffer from vomiting, abdominal pain, diarrhea and other symptoms. Once peritoneal cancer patients have the above mentioned symptoms, they should pay attention to them, go to regular hospitals, have relevant examination and cooperate with doctors to take relevant treatment measures. In daily life, patients should ensure sufficient rest time and do not overwork.