Bleeding in the middle of two menstrual periods is ovulatory bleeding. The middle of the menstrual cycle is the period of ovulation. After ovulation, the level of estrogen in the body physiologically decreases and the endometrium is partially exfoliated and bleeds due to the lack of estrogen support, which is ovulatory bleeding. Ovulatory bleeding is relatively regular and may occur in the middle of the menstrual cycle for 3-5 months in a row or occasionally 1-2 times a year, which is a normal physiological phenomenon and does not require treatment. There are very few women who have bleeding in the middle of their periods due to menstrual disorders or cervical lesions or endometritis, which require gynecological examination, ultrasound, blood tests for sex hormones and other gynecological tests to identify and decide whether to treat.