The demand for dysmenorrhea treatment in Japan is projected to grow from USD 382.8 million in 2025 to USD 643.0 million by 2035, at a CAGR of 5.3%. Non‑steroidal Anti‑inflammatory Drugs (NSAIDs) will dominate with a 60.0% market share, while primary dysmenorrhea will lead the dysmenorrhea type segment with a 65.0% share.