Menopause is a natural part of aging. As you age, the number and quality of your eggs decline, hormone levels fluctuate, and your menstrual cycle becomes less predictable until it finally stops completely.
Causes of early menopause
Certain lifestyle choices and medical treatments can cause or are linked to an earlier menopause, including:
Smoking. On average, women who smoke reach menopause 1½ years earlier than those who don't. The longer you have smoked and the more you smoke, the stronger this effect is likely to be.1