4 phases of menstrual cycle
- how long is each period cycle
- how long is one period cycle
- how long is each menstrual cycle phase
- how long is one menstrual cycle
What is considered last day of period
21 day menstrual cycle causes!
What’s “normal”?: menstrual cycle length and variation
Top things to know:
The length of your cycle is the number of days between periods, counting the first day of your period until the day before your next period starts
For adults not using any form of hormonal contraception, a typical cycle length ranges between 24 to 38 days
Using hormonal birth control may change the length and variation of your cycle
The menstrual cycle is more than just your period—it’s the rhythmic changes of your reproductive system.
The changes throughout the menstrual cycle are governed by hormones, which include estrogen, progesterone, follicle stimulating hormone, luteinizing hormone, and others (1). They trigger the growth of follicles (fluid filled sacs containing eggs) in the ovaries, the release of an egg (ovulation), and the growth and shedding of the uterine lining (also called the period) (1).
Your menstrual cycle can let you know when everything is working as usual, when your body is going through a change, or when something’s not as it should be.
Some variation in your cycle i
- how many days between each period cycle
- how long between each menstrual cycle