Amenorrhea is a gynecological symptom, mainly divided into two categories: 1, physiological amenorrhea, such as before puberty little girls will not come to menstruation, can be called amenorrhea; pregnancy, during pregnancy will not come to menstruation, can also be called amenorrhea; lactation, after menopause, etc. belong to the physiological amenorrhea; 2, pathological amenorrhea, that is, when the period does not come, or once came to menstruation late and do not come to menstruation, professionally known as primary amenorrhea, secondary amenorrhea; whether primary or secondary amenorrhea, need to explore the causes, give the corresponding treatment, so as to avoid bringing more trouble to patients.