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Amenorrhea
Absence of at least three consecutive menstrual cycles.
Cessation or absence of menstruation. Can result from low body weight, intensive exercise, eating disorders, or hormonal abnormalities, and is often seen alongside the female athlete triad.
How one textbook covers it
Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Cessation or absence of menstruation. Can result from low body weight, intensive exercise, eating disorders, or hormonal abnormalities, and is often seen alongside the female athlete triad.