The difference between ovarian cancer bleeding and menstruation is that ovarian cancer bleeding is relatively large, while menstrual bleeding is relatively small, averaging about 60 ml. In ovarian cancer, the bleeding volume is large and there is no menstrual pain during menstruation, but women may experience menstrual pain during menstruation. During menstruation, the menstrual cycle is usually 28-30 days, but ovarian cancer patients may experience menstrual disorders, such as frequent and increased menstruation, accompanied by abdominal pain and bloating. Ovarian cancer is the most common malignant tumor of female genitalia, with a high degree of malignancy. It can be distinguished from menstruation according to bleeding volume, menstrual pain and menstrual disorders, etc. If abnormalities occur, it is necessary to go to hospital for examination in time for early detection of ovarian cancer.