gynecology and obstetrics
Amenorrhea
Introduction
Amenorrhea (the absence of menstruation) can be primary or secondary. Primary amenorrheais failure of menses to occur by age 15 years in patients with normal growth and secondary sexual characteristics. However, absence of menarche and of any breast development by age 13 should prompt evaluation for primary amenorrhea. is the absence of menses for 3 months in patients with regular menstrual cycles or for ≥ 6 months in patients with irregular menses ( General references ). 