Menstrual cycle & ovulation
Amenorrhoea means no periods for several months in someone who previously had them (secondary) or periods not starting by the expected age (primary). Causes include pregnancy, low body weight, excessive exercise, PCOS, thyroid or prolactin problems and premature ovarian insufficiency, so it should be assessed.
Also known as: amenorrhea, no periods, absent periods
Sources
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.