Introduction

Amenorrhea is the absence of menstruation. There are two types of amenorrhea: primary and secondary. When a girl reaches age 16 and has not begun menstruating, she may have primary amenorrhea. When a woman who has been having periods misses three in a row, she is considered to have secondary amenorrhea. Secondary amenorrhea is more common than primary amenorrhea. Amenorrhea is a sign of another condition, not a disease itself. Many things can cause it, from low body weight to hormonal imbalances to problems with the pituitary gland. Usually the underlying condition is not serious.

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