If you are 40 years old and do not have menstruation, consider that the uterus may atrophy due to the decline of ovarian function, such as premature ovarian failure; if the ovarian function is normal, but the endometrium is damaged caused by the uterine lining, the uterus will not appear atrophy, such as uterine cavity adhesion. It is recommended to consult the doctor in time to identify the cause, and actively treat under the guidance of the doctor. In the exclusion of the pregnancy state, 40-year-old women exist for a long time without menstruation, blood tests suggest that the ovarian function decline, the emergence of perimenopause early arrival of the situation. In this case, the woman enters menopause early, and the hormone level in the body decreases and is unable to maintain the growth of the uterine lining, which is clinically manifested by the disappearance of menstruation and other accompanying symptoms of menopause. This age group is earlier than the normal perimenopausal period, and clinically, it is usually considered that it may be premature ovarian failure, which is related to autoimmune, viral infections, and medical injury, etc., and requires targeted examination and treatment under the guidance of a doctor. If there is no menstruation at the age of 40, it is considered to be caused by damage to the uterine lining, at this time, ovarian function is normal, and the uterus will not show signs of atrophy.