What is considered the standard healthy range for an adult menstrual cycle?
Answer
21 to 35 days
A healthy menstrual cycle for the majority of adults spans between 21 and 35 days. This duration is measured from the first day of bleeding in one period to the first day of bleeding in the next. While many people associate the 28-day mark as a required standard, this is merely an average. Consistency in cycling within the 21-to-35-day window is a reliable indicator of healthy endocrine function, and minor month-to-month fluctuations within this range are generally considered normal and not cause for concern.
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