Irregular periods
For the first 1-2 years after the first period, cycles are often irregular. Later, stress, weight change, thyroid problems, PCOS and heavy exercise are common causes.
See a doctor if cycles are shorter than 21 or longer than 35 days, or you miss 3 periods in a row.
At a glance
Do
- Track your cycle dates
- Change your pad or product on time
- Drink water and rest when you need to
Do not
- Do not feel shy or hide your pain
- Do not use one product for too long
- Do not ignore very heavy bleeding or fainting
Before you start 0 / 3
Steps
Write the first day of every period for 3 months.
Look for causes: stress, exams, big weight change, new diet, poor sleep.
Wrong: skipping meals or crash dieting to 'fix' it.
Right: regular meals, sleep, and a doctor visit with your notes. Tests may include thyroid and hormone blood tests.
You may also need
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Last reviewed: 31 October 2026 · About and sources
Sources
Compiled from these public health sources. This is education, not medical advice.