Hormones
The hypothalamus releases GnRH in pulses, telling the pituitary when to release FSH and LH. Significant weight loss, very heavy exercise, stress or illness can suppress these pulses, causing hypothalamic amenorrhoea — periods stop and ovulation ceases, usually reversibly.
Also known as: hypothalamic
Related Australia guides
Sources
- Healthdirect Australia (healthdirect.gov.au)
- Pregnancy, Birth and Baby (pregnancybirthbaby.org.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.