What specific range, in days, defines a cycle length considered normal for most adults?
Answer
21 to 35 days
Although the 28-day cycle is frequently cited as a standard benchmark, biological reality allows for a much wider variation considered normal for an adult. A cycle is deemed within the typical pattern if its total length falls anywhere between 21 days on the short end and 35 days on the long end. Cycles that reliably fall outside of this 21-to-35-day window, such as those consistently shorter than 21 days or longer than 35 days, may signal an underlying disruption in hormonal balance and often warrant medical consultation to investigate potential causes.
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