Causes of irregular periods in 20s
- how long should your period be irregular
- how long can your period be irregular after stopping birth control
- how long can your period be irregular after birth
- how long will your period be irregular after plan b
Effects of irregular periods on body
Sudden change in menstrual cycle length!
Irregular periods
Irregular periods are not usually a sign of a problem. But speak to a GP if your periods are irregular or your normal pattern of periods changes.
Check if you have irregular periods
The average gap between periods starting (the menstrual cycle) is around 28 days.
It can sometimes be a bit shorter or longer.
A woman's periods are irregular if the gap between them is less than 21 days or more than 35 days.
Irregular periods can affect anyone who has periods.
It's more likely for your periods to be irregular when they first start during puberty, and when you're nearing menopause.
Keeping track of your periods
Using an app or a diary to keep track of your periods can help you see if they're irregular.
Day 1 of your menstrual cycle is the first day of your period.
The last day of your cycle is the day before your next period.
Causes of irregular periods
Common causes of irregular periods include:
Sometimes, conditions like polycystic ovary syndrome (PCOS) and an underactive thyroid gland can cause irregular periods.
Non-urgent advice: See a GP if:
- how long can your period be irregular
- how long will my period be irregular after stopping the pill