Complications of ovarian cancer in late stage mainly include the following: 1. Bowel obstruction: it is the most common type of late stage ovarian cancer complications, with the incidence rate between 15% and 35%, and the higher the stage of ovarian cancer, the higher the incidence rate; 2. Fever and infection: it is also one of the complications of ovarian cancer in late stage, and late stage cases are prone to infections because of nutritional obstruction, immunosuppression, and factors such as bowel obstruction and ascites, etc.; 3, Almost all advanced complications of ovarian cancer have different degrees of pain, the mechanism of which is that after ovarian cancer spreads widely, a large amount of ascites causes the intra-abdominal pressure to rise, the tumor grows rapidly and causes necrosis, accompanied by bleeding, infection, peritoneal metastasis compresses or infringes on the nerves, which leads to the pain. 4. Renal metastasis of ovarian cancer causes acute renal failure, which is not rare, mainly due to the large amount of ascites in advanced cases, ureteral obstruction, pyelonephritis, and the high risk of infection in advanced cases. It is mainly due to large amount of ascites, ureteral obstruction, hydronephrosis, and nephrotoxicity caused by large amount of cisplatin in chemotherapy drugs.