Menstrual Irregularity
Periods can vary, especially around puberty and menopause. Learn what counts as an irregular pattern, what can contribute, and when to arrange medical advice.
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Independent clinical validation is pending.
Quick Reference Facts
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In simple words
Menstrual irregularity means your periods have changed from their usual timing, duration or pattern. For many adults, a gap of less than 21 days or more than 35 days is considered irregular, but normal patterns vary with age and life stage.
An irregular cycle is not automatically PCOS. Puberty, perimenopause, pregnancy, contraception, stress, major weight change, thyroid conditions and other health factors can all affect periods.
Common Causes
- Puberty, perimenopause, pregnancy, breastfeeding or hormonal contraception
- Stress, anxiety, major weight change or a high level of exercise
- PCOS, thyroid conditions or another hormone-related condition
- Some medicines or an underlying health condition
Clinical Red Flags
Seek urgent medical attention at an emergency department or primary care clinic if you present with any of the following symptoms:
- Get urgent help for very heavy bleeding with fainting, severe pelvic pain, shoulder-tip pain, dizziness, or a possible pregnancy.
- Arrange prompt medical advice for bleeding between periods, after sex or after menopause, or for periods lasting more than 7 days.
- See a clinician if you miss three periods in a row, your usual pattern changes, or irregular periods are affecting fertility or daily life.
Lifestyle & Diet Support
Track the first day of each period, the length of bleeding and any pain, bleeding between periods, acne, hair changes or mood symptoms. A calendar or app can make a pattern easier to discuss. Avoid self-starting hormonal or complementary medicines for unexplained bleeding; seek care promptly for the warning signs above.
Frequently Asked Questions
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Differential Diagnosis Matrix
A clinician may ask about your usual pattern, pregnancy possibility, contraception, weight and stress changes, medicines and related symptoms. Blood tests or other assessment are considered when the history suggests they are needed.
Reference Citations & Evidence Sources
Clinical Reviews & Textbooks
- CIT-0139Clinical Review pending verification
- CIT-0140Clinical Review pending verification
Clinical Connections
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