Early and late menstruation, along with the age of more than 40 years old can be considered to enter menopause, if the patient is less than 40 years old is not considered to enter menopause. 1. Menopause is a condition in which the patient is older than 40 years old and has symptoms such as early or late menstruation due to the decline of ovarian function, and the sex hormone test for follicle stimulating hormone and luteinizing hormone is more than 40 IU/L. The patient’s sex hormone test results are the same as those for early menopause. 2. aged less than 40 years old, symptoms and test results are the same as above, then it is early detection of ovarian insufficiency. 3. at the age of less than 40 years, estrogen and progesterone level disorders, etc., can also occur in early and late menstruation symptoms, can be seen in polycystic ovary syndrome. Therefore, if menstruation occurs earlier and later than 40 years old, it can be said to have entered menopause, but not vice versa. The mechanism of menstrual disorders is complicated, so it is recommended to consult a doctor for treatment under the guidance of the hospital, and not to speculate on your own in order to avoid affecting your health.