What kind of harm can be caused if menstruation does not come, clinically we can only know what kind of harm can be caused according to the cause of menstruation, specifically as follows: 1. If polycystic ovary syndrome is clinically caused by menstruation does not come, without clinical intervention, the endometrium will appear abnormal thickening, which may lead to endometrial cancer; 2. If the endometrial lining is damaged after the abortion and the uterine cavity is adhered, the clinical danger is that the menstruation does not come, and it may lead to infertility; 3. If the menstruation does not come due to premature ovarian failure, the corresponding menopausal symptoms will appear, such as decreased libido, osteoporosis and even cardiovascular disease.