Bleeding again a few days after the end of the period, i.e. bleeding in between periods, has more causes, commonly ovulatory bleeding, and may also be associated with certain diseases. Ovulatory bleeding is defined as a small amount of vaginal bleeding that occurs on the day of ovulation or the day before ovulation. If a woman has a regular menstrual cycle of about 28 days, ovulation occurs around the 14th day of her menstrual cycle. Vaginal bleeding that occurs during this period is called ovulatory bleeding or pre-ovulatory bleeding. Ovulatory bleeding is a normal physiological phenomenon and does not require treatment, so patients should not worry too much. However, if vaginal bleeding does not occur during ovulation, you should be alert to the possibility that it may be related to certain diseases, such as submucosal fibroids, endometrial polyps, cervical polyps, endometrial hyperplasia or endometrial cancer. In this case, patients are advised to seek medical attention to identify the cause and give targeted treatment. Since the causes of bleeding between periods are complex and may not be distinguishable by individuals, patients are advised to seek medical diagnosis and treatment promptly after abnormal vaginal bleeding occurs.