Whether it is normal to have no period for a month cannot be generalized, but needs to be analyzed in conjunction with the cause. The normal menstrual cycle for women is 21-35 days, and the average menstrual cycle is 28 days, 7 days early or late is normal. A month without menstruation, i.e. within the range of 21-35 days, is a normal menstrual cycle and there is no need to be overly anxious. In addition, if you have had unprotected sex recently, you need to exclude the possibility of early pregnancy, you can take an early pregnancy test, and if necessary, go to the hospital to take a blood HCG test, pregnancy can also cause no menstruation, which is a normal physiological phenomenon. If pregnancy is ruled out, it may be an abnormal condition, such as endocrine disorder, endometritis, uterine adhesions, cervical adhesions, etc., which requires targeted treatment. When these conditions occur, patients can visit the gynecology department of the hospital to check the sex hormone six to rule out the possibility of pregnancy. An occasional delay in menstruation may be caused by mental factors. Pay attention to adjusting the mentality and maintaining good habits to help the menstrual cycle return to normal.