A menstrual cycle is more than your period. It is a monthly pattern of hormone changes that affects energy, mood, appetite and sleep.
How the cycle is counted
Day 1 is the first day of full bleeding, and the cycle ends the day before your next period begins. Many cycles fall between 21 and 35 days, and it is normal for yours to vary by a few days from month to month.
The four phases in brief
- Menstrual: bleeding begins and hormones are low.
- Follicular: oestrogen rises and follicles develop.
- Ovulation: an egg is released.
- Luteal: progesterone rises, then both hormones fall if there is no pregnancy.
Read each in detail: Menstrual, Follicular, Ovulation and Luteal.
What is considered normal?
Periods commonly last between three and seven days, and cycles are often 21 to 35 days. Teenagers and people approaching menopause may see more variation. Very heavy bleeding, severe pain, periods that stop, or sudden changes in your pattern are good reasons to talk to a doctor.
Why tracking helps
Writing down your period start dates, mood and energy for a few months shows your own pattern. Try the free cycle tracker to find your phase today.