If menopause begins before the age of 40, it is called premature menopause.
Premature menopause can run in a family, or be caused by an infection, immune disorder, or chromosomal variation. Smoking has been linked to premature menopause. Surgical removal of the ovaries, or some cancer treatments, can cause premature menopause. Symptoms of menopause can be more severe and sudden in those cases.