A woman’s menstruation at the age of 40 may or may not be normal, and cannot be generalized, there are individual differences, women at the age of 35 years old, ovarian function will gradually decline, to 40 years old, there can be an accelerated trend of decline. The normal cycle of menstruation is 28±7 days, i.e. 21-35 days, and women’s menstruation depends on ovarian function. Some women’s ovarian function declines earlier, and women in their early 40s may experience a decline in ovarian function, which may be manifested by scanty, infrequent or irregular menstruation. Regular checkups should be conducted in the hospital to observe changes in ovarian function. 40-year-olds are susceptible to conditions such as leiomyoma, ovarian cysts and adenomyosis. If you are suffering from a disease that will interfere with your menstruation, it is recommended to go to the hospital and you can use ultrasound to observe it. If the above symptoms occur, it is recommended to go to the hospital in time and follow the doctor’s instructions for regular treatment as early as possible.