Bleeding during ovulation is generally related to fluctuations in estrogen levels in the body after ovulation, but other diseases caused by other diseases cannot be ruled out, and the possible causes are as follows. 1. Decrease in estrogen level in the body: When ovulation occurs, there will be a sudden fluctuation of estrogen produced by the ovaries, mainly a decrease in estrogen level. This will weaken the role of maintaining the proliferation of the endometrium, and progesterone can not immediately have a sufficient amount to inhibit the endometrium, which will cause the endometrium to be locally detached, and outflow through the vagina to form bleeding. 2. Endometrial polyps: endometrial polyps may also cause bleeding during ovulation. Usually an ultrasound is done, and when endometrial polyps are found and there is bleeding, hysteroscopic surgery can be done to remove the polyps. 3. Cesarean incision diverticulum: a history of cesarean section and ovulatory bleeding need to be alerted to this ailment. ultrasound and MRI can help in the diagnosis. Excessive exercise, exertion, and stress can be triggers for ovulatory bleeding. If the bleeding during ovulation is occasional and small in amount, it can be observed and not treated for the time being. However, repeated bleeding during ovulation or large amounts of bleeding require prompt medical attention to find out the cause of the problem.