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A teenager — heavy painful periods; primary dysmenorrhea + menorrhagia; NSAIDs help. Menorrhagia (heavy — >80ml — fibroids, adenomyosis, DUB — teens: tranexamic acid — first-line; NSAIDs; hormonal — COCP/LNG-IUS; surgery — fibroids): dysmenorrhea (primary — prostaglandins — teens — NSAIDs — mefenamic; secondary — endometriosis/adenomyosis — treat cause). Amenorrhea (primary — no menses by 16y (or 14 without secondary sexual) — Turner, MRKH; secondary — 3 months — pregnancy first — always test; then — PCOS, thyroid, prolactin, premature ovarian). The first test in amenorrhea is pregnancy — always.