Ovulation bleeding is due to the fact that estrogen reaches its peak during ovulation, and the decline of estrogen causes fluctuations in hormone levels, which leads to bleeding from the breakthrough of the endometrium, i.e. ovulation bleeding. Generally, ovulation bleeding can last for 3-7 days, and the bleeding of individual patients exceeds the amount of menstruation. If the patient has more bleeding, he or she can wait for it to clear naturally and then be treated with estrogen-progestin sequential therapy or oral contraceptive pills. Ovulation is calculated according to the individual’s menstrual cycle. If the patient’s menstrual cycle is 28 days, counting from the first day of the first menstrual period, the 14th day of the counting will be the ovulation period.