All menstruation has a certain cycle, and the interval between the first day of two menstrual periods is a menstrual cycle, usually 21-35 days, with an average of 28 days. A menstrual period that lasts for more than twenty days after menopause indicates a delayed menstrual cycle, and greater than 35 days is a scanty menstrual period. If this situation occurs once in a while, the problem is not very big, because nervousness and other emotional fluctuations, staying up late, life and work pressure, life and work environment changes, etc. may affect the menstrual flow, once in a while the menstrual cycle is delayed, for the time being, there is no need to carry out examinations and menstrual adjustment treatment, to observe the next menstrual cycle can be the next time, so long as the next menstrual cycle as scheduled, the problem is not very big. However, if the menstrual cycle exceeds 35 days each time, it means that the menstrual cycle is relatively long. It is recommended that on the third day of menstruation, you should go to the gynecology department of a public hospital and take a blood test on an empty stomach to check the six items of sex hormones, to see if it is a sex hormone abnormality caused by menstrual disorders, and if there is any abnormality, you can follow the advice of the doctor for menstrual adjustment treatment.