What's an irregular period?
A typical menstrual cycle is 21–35 days, lasting 2–7 days. Irregularity can mean your cycle is shorter or longer than this, your flow varies dramatically, or you skip periods entirely. Some variation is normal — stress, travel, and illness can all affect your cycle.
It's very common for periods to be irregular during adolescence (when they first start) and during perimenopause (when they're winding down).
When to see a GP
See a GP if your periods have become irregular when they were previously regular, if you're missing periods for more than 3 months (and aren't pregnant), if your cycles are consistently shorter than 21 days or longer than 35 days, or if your bleeding pattern changes significantly.
Irregular periods can be caused by PCOS, thyroid disorders, stress, significant weight changes, extreme exercise, or perimenopause. A GP can help identify the cause and discuss management.
What to expect at the GP
Your GP will take a detailed history of your cycles, ask about other symptoms, and may arrange blood tests (including thyroid function, hormones, and iron studies) and possibly an ultrasound. The goal is to identify the cause and manage it appropriately.
Treatment depends on the underlying cause. For PCOS, this might involve lifestyle changes and hormonal treatment. For thyroid issues, medication to regulate thyroid function. For perimenopause, symptom management. The first step is always getting properly assessed.
Related condition
Periods & menstrual health →References & sources
- 1.Periods — Jean Hailes for Women's Health
- 2.Heavy periods — healthdirect
- 3.Menstruation — healthdirect
- 4.Heavy periods — Better Health Channel
This content is general information and not a substitute for individual medical advice. Please consult a GP for your personal situation.
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