The bleeding that occurs again after a woman’s menstruation is clean may be caused by the instability of the endometrium due to fluctuations in sex hormones during ovulation, which is a normal physiological phenomenon, and this symptom will usually disappear in about 3 days. If you are a married woman, you should consider the following points: 1. The bleeding that occurs after sexual intercourse may be a normal phenomenon and may be caused by the penis damaging the vaginal mucosa during intercourse. 2. It may also be caused by endocrine disorders, such as luteal insufficiency. 3. The bleeding is also caused by cervical diseases, such as cervical erosion and cervical polyps. Therefore, when a woman has this symptom, she should be diagnosed by ultrasound and vaginal examination, cervical cancer screening, and also to exclude potential pregnancy.