Polycystic ovary syndrome usually does not cause ovarian cancer. Polycystic ovary syndrome is the most common type of gynecological endocrine disease, mainly characterized by hyperandrogenism, persistent anovulation and polycystic ovarian changes, often accompanied by insulin resistance and obesity, and the main clinical manifestations are amenorrhea, hirsutism, obesity and infertility. The main clinical manifestations are amenorrhea, hirsutism, obesity and infertility. The common treatment for polycystic ovary syndrome is ovulation promotion, menstrual regulation and hormone countermeasures. In patients with obese polycystic ovary syndrome, treatment requires diet control and increased exercise, which leads to weight loss, increased insulin sensitivity, and restoration of ovulation and fertility function. Patients with ovarian cancer are often caused by endocrine factors such as family history or early menarche and lack of fertility history, therefore polycystic ovary syndrome is usually not cancerous after active treatment.