Menorrhagia is the absence of menstruation at the normal age of menopause, and amenorrhagia is a condition in which menstruation does not occur for a long time before menopause. Most women experience menopause around the age of 50, either early or late, depending on the individual. Menopause in women is a sign of a decline in ovarian function to complete loss and a decline in estrogen. Menstruation in women is the cyclic shedding and bleeding of the endometrium that occurs as a result of cyclic changes in the ovaries. The ovaries are a gonadal organ whose main function is to produce eggs and secrete female hormones. From puberty, the ovaries begin to mature, ovulation occurs, and the secretion of estrogen and progesterone occurs. As the ovarian function matures to its peak, it gradually declines. When women are around 30 years old, the ovarian function is at its peak, and then gradually declines. After a period of time, menopause occurs when the ovarian secretion function is not sufficient to cause the endometrium to shed. The age of menopause varies from woman to woman because of the difference in hormone levels and physical condition.