PCOS and no period: what to know

PCOS can disrupt the hormonal signals that help an egg mature and release. This is called [Anovulation](/conditions/anovulation/). Without regular ovulation, the womb lining may not follow a predictable cycle, so bleeding can be absent, delayed or unexpectedly heavy. A [Missed Period](/symptoms/missed-period/) is a symptom, not a diagnosis. Pregnancy, major changes in weight or exercise, thyroid problems, breastfeeding and some medicines can also affect bleeding. PCOS is associated with [Periods Stopped](/symptoms/periods-stopped/), but no period does not by itself confirm PCOS.

If pregnancy is possible, arrange a pregnancy test and tell the clinician when your last bleed occurred. Keep a simple record of spotting, bleeding, pain, medicines and cycle gaps. A clinician may review symptoms, examine you and request blood tests or an ultrasound to assess hormones, the womb lining and other explanations. Treatment depends on whether you want pregnancy now. Options may include cycle protection with prescribed hormones, ovulation support when appropriate, or the [Combined Pill](/treatments/contraception-and-family-planning/combined-pill/) when suitable. Do not start or stop hormonal treatment without advice.

Arrange medical care for a new or persistent change in bleeding, repeated missed periods, or difficulty conceiving. Seek urgent help for severe or one-sided pelvic pain, fainting, shoulder-tip pain, or bleeding that rapidly soaks pads, especially if pregnancy is possible. These symptoms need prompt assessment because they can signal a problem unrelated to PCOS.

Ask what may be causing the absent bleeding, whether you need a pregnancy test or hormone checks, how to protect the womb lining, and which option fits your pregnancy plans. If conception is taking longer than expected, discuss [Trouble Getting Pregnant](/symptoms/trouble-getting-pregnant/) and fertility support.