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Primary amenorrhea is a condition when a girl has not started menstruating by the time she is 16, even though other signs of puberty, like breast development and the appearance of pubic hair, are normal. Besides hormonal abnormalities and other illnesses, low body weight or obesity, stress and rigorous exercise can cause primary amenorrhea.Join our online group on primary amenorrhea to contact experts, ask questions, share experiences, and learn more.