Some patients have less menstruation, this kind of menstruation comes a day without the following reasons: 1, women who have sex should first rule out pregnancy, most women will have a small amount of vaginal bleeding in early pregnancy, when its thought to be menstruation, but it may be pregnancy; if you go to the hospital for examination, be sure to tell the doctor the time of the last menstruation, do a urine pregnancy test or blood HCG to rule out pregnancy; 2, also consider uterine cavity adhesion , endometritis, endocrine-related diseases, and if there is a recent history of uterine operations, such as scraping, abortion, etc., it will lead to endometrial damage and menstruation will decrease; 3. Some patients with insufficient estrogen level or bleeding during ovulation will have spotting bleeding, not necessarily menstruation; if there is repeated ovulatory bleeding, an ultrasound at the time of bleeding will clarify the diagnosis. The next time when ovulation occurs, proper estrogen supplementation will reduce this bleeding. Patients with thin endometrium or real menstruation becoming less frequent can be treated with oral medications such as Tocopherol. If the lining has a certain thickness, menstruation will increase, but some patients will have less menstruation even with medications that promote lining growth, which requires further hysteroscopy or separation of uterine adhesions for diagnosis and treatment.