Fertility basics
Infrequent periods usually reflect infrequent ovulation. Polycystic ovary syndrome is the most common cause, but thyroid problems, prolactin excess and low energy availability also feature.
Also known as: oligomenorrhea, long cycles, infrequent periods
Related Canada guides
Sources
- Society of Obstetricians and Gynaecologists of Canada (SOGC) patient information
Last reviewed: September 9, 2026. Written by the Antega Editorial Team. General information only — always follow the advice of your own clinic, doctor or pharmacist.