Ovulatory bleeding is a small amount of vaginal bleeding that occurs in the middle of two menstrual cycles, i.e. on the 12th-16th day of the menstrual cycle, and may last for a short or long time, from a few hours to several days, and may be accompanied by mild lower abdominal discomfort or lower back pain. Ovulatory bleeding is usually less than normal menstruation and can stop on its own. The color of the bleeding may be coffee-colored, occasionally bright red, drip-like, or with blood in the leukorrhea. It is usually due to a temporary decrease in the level of estrogen produced by the ovaries after ovulation. The endometrium, which lacks estrogen support, will atrophy, shed and necrosis, and vaginal bleeding will occur. Patients often have symptoms such as lower abdominal cramping and discomfort, lower back pain and even anal cramping. Women with ovulatory bleeding may also have ovulation pain radiating to the legs. During ovulation, due to fluctuations in the level of hormones secreted by the ovaries, follicles rupture and follicular fluid flows into the pelvic cavity, stimulating the pelvic peritoneum and causing lower abdominal distension and pain, or follicular fluid accumulates in the rectal trap of the uterus, causing a feeling of anal cramping. If a woman has prolonged or massive ovulatory bleeding symptoms, it is recommended to visit a hospital, where she can use hormonal drugs under the guidance of a doctor to inhibit ovulation and improve hormone levels, or use ovulation-promoting drugs to improve follicle quality.