Why is my period late?
How late is “normal”?
A few days’ variation is common. If you are repeatedly more than 7 days late, or you miss periods for 3 months (amenorrhea), it is worth checking with a doctor.
Common reasons a period is late
Pregnancy (rule out first if sexually active); stress and poor sleep; significant weight change or heavy exercise; polycystic ovary syndrome (PCOS); thyroid imbalance; perimenopause; and some medications or recent emergency contraception.
See a doctor if you have
- No period for 3 months after ruling out pregnancy
- A late period with severe pain, excess hair growth or acne, or big weight changes
- Possible pregnancy with pain or bleeding
Frequently asked questions
How many days late is normal?
Up to about 7 days. If you are sexually active and more than a week late, take a pregnancy test.
Can stress delay my period?
Yes — stress affects the hormones that trigger ovulation and can push your period back by days.
More free tools
In this section: Periods
References
- NHS – Stopped or missed periods
- ACOG – Amenorrhea
- Mayo Clinic – Menstrual cycle
This page will be reviewed by a named OB-GYN before launch. Educational content — not medical advice.
Medical disclaimer: This tool and content are for educational purposes only and are not a substitute for professional medical advice. If something feels wrong, see a doctor.