Clinically, bleeding during ovulation is commonly seen in the following cases: First, it may be due to inflammatory diseases of the female endometrium, such as endometritis or endometrial erosion. In normal women, the endometrium has recovered completely during ovulation, and the small arteries have finished contracting and the coagulation function has returned to normal, so there should not be any bleeding. However, if a woman has inflammation of the endometrium, the repair process will take so long that it can be delayed until ovulation, when the woman’s endometrium can still bleed and be discharged through the vagina. Secondly, it may be caused by a systemic disease, such as a disorder in the coagulation function of some women, which can cause the endometrium to bleed slowly even though it should have stopped bleeding. This can prolong the bleeding until ovulation, such as a decrease in the number of platelet tracts or a lack of clotting factors, which can cause bleeding during ovulation.