(HealthDay News) -- Menopause that begins before age 40 is considered premature.
The Womenshealth.gov website explains these possible causes of early menopause:
Medical treatments, from chemotherapy or radiation, or surgical removal of the ovaries.
Chromosomal abnormalities affecting the ovaries.
A family history of early menopause.
A medical problem, such as rheumatoid arthritis or thyroid disease.