If you usually have regular menstruation, but suddenly do not have menstruation, and have back pain, stomach pain, it is clinically recommended to rule out the possibility of pregnancy, you can collect the morning urine and use the early pregnancy test paper to detect. If there is no pregnancy, this situation is mostly due to endocrine disorders, clinically you can drink brown sugar water to promote menstruation for 3 days, if there is still no menstruation, you can take oral progesterone pills to promote menstruation, once a day, 2 pills at a time, take 3 consecutive days, after stopping the drug 3-7 days will come to menstruation. If on the 8th day after stopping the medicine, there is still no menstruation in the clinic, it is recommended to go to the hospital to do a detailed examination, mainly to rule out the menopause caused by a certain disease, first of all, to understand whether the ovarian function is normal or not, and to rule out the possibility of premature failure of the ovarian function.