If you have a normal menstrual cycle and suddenly do not have a period for two months, it is often due to the following reasons: 1. If you have a normal sexual life without contraception, it is likely that the menopause is caused by pregnancy, and it is recommended to collect morning urine and test with early pregnancy test paper. 2. If pregnancy is ruled out, it is likely to be caused by endocrine disorders. It is also possible that the menstrual disorder may be caused by emotional stimulation, long-term anxiety, insomnia, environmental changes, or cold stimulation. 3, caused by certain diseases, such as premature ovarian failure, and polycystic ovary syndrome. It is recommended to have the corresponding examination and then give the corresponding treatment according to the result.