Bleeding during coitus and then no more the next day may be related to factors such as vaginal trauma, gynecological inflammation or hormonal secretion abnormalities. 1. Vaginal trauma: If your partner’s movements are too strenuous during intercourse, or if your vaginal secretions are not enough to lubricate the vaginal walls, your partner’s penis and scrotum may cause capillary rupture around the dry vagina and labia of the woman, resulting in the phenomenon of bleeding in the same period of time, and the next day, the capillaries will scab over and heal on their own and the bleeding will stop. 2. Gynecological inflammation: If a woman suffers from cervicitis, vaginitis and other gynecological inflammation, the partner’s penis may touch and hit the inflammation of the affected area, resulting in rupture of the affected area of the weak mucous membrane bleeding, usually small amount of bleeding, the next day can be healed on its own. 3. Hormone secretion abnormality: If a woman is in the ovulation period when having sex, it is possible that due to the high level of hormones in the body, the endometrium is shedding, thus causing a small amount of bleeding symptoms, usually the next day can subside. There are many reasons why bleeding during intercourse is gone the next day, and women who suffer from bleeding during intercourse along with other symptoms such as abdominal cramps are advised to go to the gynecology department of a regular hospital in a timely manner.