If vaginal bleeding occurs again after the menstruation is clean, the following causes are common: 1. If the menstruation is not completely clean and the menstruation returns, it is mostly due to the poor recovery of the endometrium caused by the stimulation of intercourse. 2. Irregular vaginal bleeding, which can also be manifested as vaginal bleeding after the menstruation is clean and occurs again in a few days, is related to endocrine disorders, such as anovulatory menstruation, or luteal atrophy. 3. Uterine fibroids or cysts in the adnexal area are also prone to menstrual disorders, especially submucosal fibroids, which are prone to irregular vaginal bleeding, and ovarian cysts or ovarian tumors with secretory function, which can also lead to menstrual disorders. 4. Cervical lesions, such as cervical polyps or cervical cancer, can also manifest as repeated vaginal bleeding.