Menopause is defined as the permanent cessation of menstruation and fertility, occurring naturally around age 45-55. It marks the end of the reproductive phase of a woman's life. There are typically four phases - pre-menopause, peri-menopause, menopausal, and post-menopausal. Common symptoms include hot flashes, night sweats, sleep issues, urinary problems, and mood changes. Hormone therapy can help treat symptoms but comes with some health risks, so lifestyle changes and non-hormonal options are usually recommended first.