Cycle and ovulation
Hypothalamic amenorrhoea occurs when low energy availability — from under-eating, heavy training, rapid weight loss or significant stress — suppresses the GnRH pulses that drive the cycle. It is usually reversible with increased nutrition, reduced training load and support, and this is generally addressed before fertility medicines are considered.
Also known as: HA, functional hypothalamic amenorrhoea, FHA
Related Australia guides
Sources
- Royal Australian and New Zealand College of Obstetricians and Gynaecologists (ranzcog.edu.au)
Last reviewed: 10 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.