The first of these is to make sure that you have a good understanding of the situation. It is recommended to seek medical advice and take progesterone, estradiol valerate and other progesterone and estrogen drugs to regulate, and it is also recommended to work regularly, ensure regular meals, and stop unhealthy weight loss methods, generally menstruation can be restored; 2, pregnancy: for women of childbearing age with regular menstruation in the past and a history of unprotected sex, three months without menstruation may be due to pregnancy. If there are also symptoms such as nausea, vomiting and weakness, pregnancy is highly suspected. It is recommended to go to the hospital for blood HCG and ultrasound examination to confirm the diagnosis, if there is no abnormality, the pregnancy can be continued, and after that, regular obstetric checkups are needed; 3. Uterine adhesions: can lead to abnormal menstruation, such as low menstrual flow, amenorrhea, etc., often accompanied by symptoms of cyclic abdominal pain. The diagnosis should be confirmed by serum hormone level measurement and ultrasound examination. Medication can be used to regulate the menstrual cycle according to the doctor’s prescription, and glucocorticoid steroids such as dexamethasone can be taken to lower the blood androgen level to help the recovery of menstruation. Daily attention to a balanced diet, quit smoking and drinking, less coffee, active exercise, etc.; 5. Perimenopause: The decline of ovarian function during perimenopause can lead to delayed menstruation, often accompanied by skin flushing, excessive sweating, insomnia, dreaminess, abnormal emotional irritability and other symptoms. Usually, there is no need to take medication. However, if the symptoms are more severe and cannot be tolerated, you may seek medical treatment. Perimenopause is a process that every woman goes through. It is recommended to relax, face the changes positively and reduce unnecessary worries.