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Periods and cycles, explained

Straight answers to the questions people actually ask, written in plain English and checked against sources worth trusting.

Showing 25 to 26 of 26 articles

Cycle-dial graphic labelled "Vital signs" with the heading "Pulse, pressure, and your cycle" and a dial reading "Set out in 2006", the ring split into period, fertile and luteal segments.

Cycle Science

27 July 20267 min read

Your Cycle Is a Vital Sign

Clinical guidance has treated the menstrual cycle as a fifth vital sign since 2006, reaffirmed as recently as 2025, with a reference range and a list of patterns worth a GP visit.

First Period

27 July 20269 min read

Your First Period: Everything You Need to Know

A calm, complete guide to your first period: what to expect, what counts as normal, and what to do right now.