There are several reasons for delayed menstruation, as follows: 1. Judging by the age of the patient, if the child is an adolescent and has not had sex. Irregular menstruation will occur during the establishment of the endocrine axis, and regular menstruation will take 5-7 years to wait. In case of a fertile woman, this is the time to first rule out pregnancy and also to check for abnormalities in ovarian function and abnormalities in the endocrine axis above the ovaries. The endometrium appears abnormal. In addition, menstruation in TB patients is gradually delayed, reduced and gradually does not occur. By perimenopause, menstruation will show irregularity; 2. Check whether other diseases are combined; 3. Determine which conditions need treatment and which do not. Different treatment methods are adopted for patients of different ages, expectant therapy can be used for adolescent children, active treatment for those in perimenopause, and appropriate treatment for fertile women according to patient needs.