It is normal for a 45-year-old woman to delay her menstrual cycle for no more than 7 days. Some 45-year-old women are already in the transition period of menopause, and their menstrual pattern has already changed. At the age of 45, some women’s ovarian function has not declined, and the level of estrogen and progesterone in the body is in a relatively stable state, which can maintain a regular menstrual cycle. At this time, the delay of the menstrual cycle does not exceed 7 days is normal, and the menstrual period usually lasts for 3 to 7 days, and the volume of menstruation varies from 5 to 80 ml. Some women at the age of 45 are already in the transition period of menopause, the ovarian function has declined, the level of estrogen and progesterone in the body is out of balance, unable to stimulate the endometrium to undergo cyclic proliferation and shedding, so the menstrual cycle does not have a fixed regularity, and after menopause the menstrual cycle stops, the woman is amenorrhea. When patients have menstrual disorders, they should seek medical attention to clarify the cause of the disorder, and if it is an abnormality, treat it as soon as possible, so as to avoid delaying the condition, which may lead to undesirable consequences.