Menstrual cycle

A cycle is counted from the first day of one period to the day before the next. Typical cycles last about 21 to 35 days. It has a follicular phase, ovulation and a luteal phase, each controlled by hormones from the brain and ovaries.

Also known as: period cycle, monthly cycle

Last reviewed: 23 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.