We found hypothalamic amenorrhea and hyperandrogenism to be frequent endocrine mechanisms of menstrual disorders in teenagers. Concomitant eating disorder was highly frequent and secondary amenorrhea was associated with anorectic behavior. It is important to evaluate endocrine patterns and eating behavior in adolescents with menstrual disturbances to ensure adequate medical care and treatment.

Menstrual disturbances and eating disorders were still frequent after six years in a follow-up of women who had menstrual disturbance in adolescence. PCOS was the main cause explaining persistent menstrual disorder, whereas recovery of anorectic eating disorders predicted resumption of menses. The findings call for a continued follow-up of women diagnosed with menstrual disturbance in their teens.

This clinical follow-up study has demonstrated a high frequency of osteopenia in women diagnosed with menstrual disorders in adolescence. Previous anorectic behavior was the strongest negative predictor of BMD. It is important to pay attention to an underlying eating disorder in young women with menstrual dysfunction in order to promote bone health.

We found that girls were less satisfied than boys with life, their bodies, and sexuality. Weight-control behavior was notably common among teenage girls and could indicate eating disorder problems. These gender differences should be taken into account for the adequate care and treatment of young people and important when designing youth-friendly clinics and the help they can provide.