Ovulation is a transitional time when the follicle is close to maturity and ovulation. When the follicle is close to maturity, it can be up to 2.0-2.5 cm in size, the ovary is significantly enlarged, the follicular surface ruptures during ovulation, and follicular fluid flows out. Some patients may also experience bleeding from the ovaries. The follicular fluid and blood irritate the surrounding organs and can cause abdominal pain, bloating, abdominal cramping and even a feeling of anal cramping in the abdomen. Some patients may also experience a small amount of vaginal bleeding during ovulation, which is mild and usually resolves on its own within 24-48 hours, so there is no need to worry too much. If the abdominal pain during ovulation is prolonged, it is important to consider the possibility of secondary inflammation. Because of chronic pelvic inflammatory disease and adhesions in the peri-pelvic tissues, the stimulation of follicular fluid can aggravate the onset of pelvic inflammatory disease. If the symptoms are very mild, women with fertility needs can arrange intercourse when ovulation pain occurs, when the conception rate will be relatively high. During ovulation, because of hormonal changes, there is a small decrease in estrogen, which causes the endometrial lining to peel off, and ovulatory bleeding will occur, usually in small amounts, lasting 3-5 days, with the longest period not exceeding 7 days. If intercourse is arranged during this period, bleeding can occur at the same time. If bleeding after intercourse occurs during the non-ovulatory period, be on high alert and clarify the cause of bleeding to avoid delaying the disease. First of all, cervical lesions should be ruled out. This can be done by gynecological examination, checking the exfoliated cells of the cervix, testing TCT and HPV to clarify whether there is infection and whether there are early lesions of the cervix. In addition, ultrasound can clarify whether there are endometrial polyps or submucosal fibroids, because patients with endometrial polyps and submucosal fibroids may bleed after intercourse due to sexual excitement stimulating the uterus to contract and stimulate the endometrial wall.