The clinical symptoms that may occur in patients at the time of ovulation are mainly the following: First, there can be distention or pain in the abdomen on the ovulation side. The feeling of distention and pain at ovulation is mostly seen in patients with adnexitis or endometriosis, and most patients can feel nothing during ovulation. Secondly, there can be increased, sticky and stretched leucorrhea, which is related to the change of hormone level during ovulation. Thirdly, a small amount of vaginal bleeding or leukorrhea with blood is called ovulatory bleeding, which is mainly caused by the sudden drop of estrogen at the time of ovulation that causes the endometrial lining to peel off. Fourthly, women’s libido can be increased during ovulation, which is mainly related to the increase of androgen level during ovulation, which can increase women’s libido and increase the chance of conception.