Delayed or early menstruation is not good, whether it is delayed or significantly early, is an abnormal situation. Normal menstrual cycle is 21-35 days, if more than 35 days to have a menstrual period, this is the menstrual cycle significantly prolonged, at this time need to be followed up with relevant such as sex hormone six test, to understand the ovarian function is not a decline in reserve function or there is no tendency to menopause. If the menstrual cycle is significantly shortened, shorter than 21 days, it is necessary to follow the appropriate diagnostic and treatment procedures. If the menstrual cycle is frequent and abnormal, the diagnosis and treatment of abnormal uterine bleeding should be carried out, and other conditions such as ovarian luteal insufficiency and atrophy should be ruled out.