What are the signs of an irregular period?
Short answer: Signs include cycles that vary widely in length, missed periods, unexpected spotting between periods, unusually heavy or very light bleeding, or new severe pain. If your cycle pattern changes suddenly or you miss three or more periods, it is considered irregular and merits evaluation.
Explanation
An average menstrual cycle is about 21–35 days from the first day of one period to the first day of the next, and flow usually lasts 2–7 days. An irregular period can mean cycle length that changes by more than about 7–9 days cycle-to-cycle, fewer than 9 periods a year (oligomenorrhea), more frequent periods (polymenorrhea), very heavy bleeding with large clots (menorrhagia), bleeding between periods (metrorrhagia), or absence of bleeding for three months or more when not pregnant (amenorrhea). New or worsening pelvic pain, dizziness or symptoms of anemia (fatigue, shortness of breath) with heavy bleeding are also red flags. Common causes include hormonal imbalances (PCOS, thyroid disorders), stress, rapid weight change, certain medications or contraception, pregnancy, and perimenopause, but a healthcare provider can determine the cause with history, exam and tests.
Tips
- Track cycle start dates, length, flow and symptoms in a calendar or app for at least 3 months.
- See a clinician if your cycle length varies widely, you miss three or more periods, or you have very heavy bleeding or severe pain.
- Take a pregnancy test if sexually active and a period is missed.
- Note other symptoms (weight changes, hair growth, skin changes, fatigue) to help diagnosis.
- Seek immediate care for very heavy bleeding, fainting, or signs of significant anemia.
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