A small amount of vaginal bleeding that occurs a few days after a clean period may be ovulatory bleeding or may be associated with certain diseases. If a woman has a regular menstrual cycle of about 28 days, ovulation is around the 14th day of menstruation. A small amount of vaginal bleeding that occurs on the day of ovulation or the day before ovulation is considered ovulatory bleeding or pre-ovulatory bleeding. The bleeding is characterized by a significantly smaller amount of bleeding than menstrual bleeding, lasting 1-3 days and often pink or brown in color. Ovulatory bleeding is a normal physiological phenomenon and does not require treatment. However, if vaginal bleeding does not occur during ovulation, patients need to be alert to the possibility that it may be associated with certain diseases, such as submucosal fibroids, endometrial polyps, cervical polyps, endometrial hyperplasia or endometrial cancer. It is recommended to seek prompt medical attention to identify the cause and provide targeted treatment. In addition, since individuals may not be able to distinguish the cause of bleeding, patients are advised to seek medical treatment promptly when bleeding occurs.