A 45-day menstrual cycle is generally longer than the standard accepted medical range of 24 to 38 days, and it is medically classified as oligomenorrhea. While an occasional long cycle can be triggered by acute stress, intense travel, or temporary lifestyle disruptions, consistently experiencing 45-day cycles often indicates infrequent ovulation or anovulation, which can be linked to polycystic ovary syndrome (PCOS), thyroid disorders, or hormonal imbalances requiring medical evaluation.
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