Menopause is the time when a woman's menstrual period ends. Menopause is considered complete when a woman has been without her period for one year. Menopause can occur any time between ages 40 and 60. On average, it occurs at age 51.

Menopause is gradual. The period of time leading up to complete menopause is called perimenopause. Premature menopause occurs before the age of 40. Menopause can also be surgically induced when the ovaries are removed.

Menopause is a natural process. Treatment is used to reduce the symptoms associated with menopause.

Menopause is caused by a gradual decrease in a hormone called estrogen. Estrogen is released by the ovaries. The decrease in estrogen eventually stops the ovaries from releasing eggs.