To check menstruation, it is recommended to go to the gynecology department of the hospital and undergo ultrasound, including endocrine hormone tests to determine the condition of the lining and whether there is any abnormality in the shape of the uterus. Because these factors can cause early or even delayed menstruation, there may be amenorrhea. At the same time, the endocrine hormone test should be done on an empty stomach to rule out the existence of abnormal hormone levels, because hormone levels can interfere with menstrual changes, which can cause the absence of menstruation or early or delayed. According to the results of the examination, the relative treatment and therapy must be carried out to avoid prolonged irregular menstruation which may cause physical effects. During the examination, try to determine how the ovarian function is, if the ovarian function is low, it will also affect the change of menstrual cycle, it is recommended to carry out the blood test of anti-mullerian hormone, which also requires fasting.