If you have not had a period for a month: 1. If you are a married woman and have not taken contraception, it is recommended to rule out the possibility of pregnancy. You can use early pregnancy test strips or take blood to test for HCG. 2. It may be caused by some kind of disease, such as tuberculosis in the pelvis, endocrine disorders, or inflammation of the pelvis. When there is inflammation in the pelvic cavity, the local inflammation of the ovaries destroys the egg cells and causes endocrine disorders, so it may also lead to non-menstruation. 3. If there is a history of uterine operation that causes damage to the endometrium and causes uterine adhesions, it may not lead to menstruation. 4. Changes in the environment and sudden cold stimulation may also lead to menopause. Therefore, clinically, we should analyze and find out the cause of the problem with a comprehensive medical history, and then give symptomatic treatment according to the cause.