Irregular period after IUD: what should you know?

A hormonal IUD can make bleeding lighter, less predictable, or absent because its hormone acts mainly inside the uterus. A copper IUD does not contain hormones and may instead bring heavier or longer bleeding, especially soon after insertion. Irregular bleeding can also occur with anovulation, polycystic ovary syndrome, perimenopause, or premature ovarian insufficiency. The bleeding pattern alone cannot identify the cause. If pregnancy is possible, take a pregnancy test; an IUD pregnancy needs prompt medical review because ectopic pregnancy must be considered.

Record bleeding dates, flow, pain, discharge, and whether you can feel the IUD threads as usual. Check a pregnancy test if a period is late or pregnancy could have occurred. Arrange a clinician review if the pattern is new, persistent, or different from the device information you were given. A clinician may check the threads, perform an examination, and decide whether tests or an ultrasound are appropriate. Do not try to remove the IUD yourself. More background is available in [Irregular Periods](/symptoms/irregular-periods/).

Seek urgent care for severe or one-sided lower-abdominal pain, fainting, shoulder-tip pain, heavy bleeding that makes you feel weak, fever, or a positive pregnancy test with pain or bleeding. Contact a clinician promptly for new pain during sex, unusual discharge, suspected IUD expulsion, or threads that feel markedly different. These symptoms can signal pregnancy complications, infection, or a device problem and should not be judged by bleeding frequency alone.

Ask whether your IUD type can explain the pattern, whether pregnancy or infection testing is needed, and how long you should monitor it. You can also ask whether anovulation or polycystic ovary syndrome deserves evaluation and which contraception or treatment options fit your goals.