The amount of menstruation may be less than a month may have a variety of reasons, common endometrial adhesion, endometrial tuberculosis, polycystic ovary syndrome, ovarian failure, thyroid function abnormalities, etc., need to be based on the specific performance to comprehensively determine, if in addition to the amount of menstruation is getting less and less accompanied by other abnormal symptoms, it is recommended to consult a doctor in a timely manner, in order to avoid delays in the condition. 1, the endometrial adhesion: often occurs in the abortion surgery, can be The symptoms of menstrual cycle disorders accompanied by cyclic abdominal pain, it is recommended to carry out hysteroscopy to confirm the diagnosis, and if necessary, surgical treatment; 2, endometrial tuberculosis: there may be scanty menstruation, or even amenorrhea accompanied by lower abdominal pain, tuberculin test and hysteroscopy should be carried out to confirm the diagnosis, the treatment should be used for anti-tuberculosis medication, but also the choice of surgical treatment; 3, polycystic ovary syndrome: there may be scanty menstruation, menstruation, accompanied by hirsutism, oily skin and other symptoms, it should be carried out in time to avoid delaying the condition, Polycystic ovary syndrome: symptoms such as scanty menstruation, low menstrual flow, accompanied by hirsuteness, oily skin, etc., serum hormone level measurement and ultrasound should be done to confirm the diagnosis, and the medication can be regulated by oral progesterone according to the doctor’s prescription, and usually pay attention to the movement of weight reduction and quitting smoking and alcohol, etc.; 4. Ovarian dysfunction: there can be low menstruation, nervousness, and dreaming, accompanied by constipation, and symptoms such as decreased libido. Other endocrine diseases: such as thyroid dysfunction or other endocrine abnormalities, it is feasible to take the corresponding hormone test to clarify the cause, according to the cause of the treatment.