The document summarizes abnormal uterine bleeding in adolescents. It discusses how irregular menstrual cycles are common after menarche due to an immature hypothalamic-pituitary-ovarian axis. The most common causes of abnormal uterine bleeding in adolescents are anovulatory cycles, pregnancy, infection, medications, stress, bleeding disorders, and endocrine disorders. The evaluation involves determining if bleeding is cyclic or acyclic, examining for pregnancy, and considering common causes like anovulation, polycystic ovary syndrome, and bleeding disorders.