Female fertility
Oligomenorrhoea means periods come infrequently, usually defined as fewer than about nine periods a year or cycles longer than 35 days. It often reflects irregular or absent ovulation and is commonly seen in PCOS, thyroid disorders and significant weight change.
Also known as: oligomenorrhea, irregular periods, infrequent periods
Related South Africa guides
Sources
- ESHRE/ICMART glossary of assisted reproductive terminology
Last reviewed: 8 September 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.