The period refers to menstruation, menstruation two months did not come without pregnancy may be due to physiological factors, such as mental factors, but may also be due to pathological factors, such as polycystic ovary syndrome, hyperprolactinemia, etc., can be taken to change the way of life, medication, etc., to the cause of the treatment. 1. Physiological factors: sudden or long-term mental depression, anxiety and other bad emotions, will affect the hypothalamus, pituitary gland and other parts of the function, thus affecting the menstrual cycle, menstruation did not come for two months without the phenomenon of pregnancy. Should maintain a good state of mind, learn to relax, through sports and other ways, to regulate. 2. Pathological factors: For example, polycystic ovary syndrome, the cause of which is not clear and is related to genetic and environmental factors, patients may have irregular menstrual cycles, low volume or amenorrhea, scanty menstruation, etc., and may be accompanied by acne, hirsutism and other manifestations. They should have a reasonable diet, appropriate physical exercise to facilitate weight loss, and follow the doctor’s instructions to use drugs such as dextroprogesterone, medroxyprogesterone acetate, and ethinyl estradiol cyproterone. Hyperprolactinemia patients can also affect women’s menstruation, manifested by two months without menstruation and no pregnancy, can be treated by oral bromocriptine mesylate tablets. In addition, there are other reasons that can cause this phenomenon, it is recommended to go to the hospital in a timely manner, identify the cause of the disease, and actively cooperate with the doctor for treatment.