The causes of ovarian cancer are not yet clear, and may be related to factors such as heredity, hormones, childbirth, and living habits. The causes of ovarian cancer have not been researched clearly, and the known risk factors include heredity, hormone, childbirth, gynecological diseases and living habits. 1. Hereditary factors: BRCA1 and BRCA2 gene mutation carriers have a higher risk of developing ovarian cancer than normal people. 2. Hormonal factors. Estrogen has a stimulating effect on ovarian epithelial cells, and postmenopausal estrogen treatment may increase the risk of cancer. 3. Fertility factors. Women who have not had children or who have their first pregnancy or delivery at an older age (>35 years old) may increase the risk of ovarian cancer. 4. Lifestyle factors. Smoking, obesity, high-fat diet and other factors may be associated with increased risk of ovarian cancer. 5. Endometriosis. Endometriosis is also a high risk factor for increased risk of ovarian cancer.