Medically reviewed by Valinda Riggins Nwadike, MD, MPH — Written by Scott Frothingham
A period (menstruation) is normal vaginal bleeding that is a natural part of a healthy monthly cycle for a person with a uterus and ovaries.
Every month, in the years between puberty (typically age 11 to 14) and menopause (typically about age 51), your body readies itself for pregnancy.
The lining of your uterus thickens and an egg grows and is released from one of your ovaries.
If pregnancy doesn’t occur, estrogen and progesterone levels fall, eventually hitting a level that tells your body to begin menstruation.
During your period, the uterus sheds its lining and it’s passed, along with some blood, out of the body through the vagina.
The average person who menstruates loses about 2 to 3 tablespoons of bloodTrusted Source during their period.
The time between periods (last day to first day) typically averages 28 days, with bleeding typically lasting around 4 to 5 days. However, people can experience longer time between periods, and fewer or more days of bleeding, and still have totally “regular” periods.
So, why do women have periods?
As a woman, your period is your body’s way of releasing tissue that it no longer needs.
Every month, your body prepares for pregnancy.
The lining of your uterus gets thicker as preparation for nurturing a fertilized egg. An egg is released and is ready to be fertilized and settle in the lining of your uterus.
If the egg is not fertilized, your body no longer needs the thicker lining of the uterus, so it starts to break down and is eventually expelled, along with some blood, from your vagina. This is your period, and once it’s over, the process starts all over again.
The way that women experience their periods varies widely. It’s important that you communicate with your healthcare provider if you have concerns about:
Cycle regularity. Is it regular each month? Irregular? Absent?
Duration of period. Is it prolonged? Typical? Shortened?
Volume of menstrual flow. Is it heavy? Typical? Light?
Can my period be stopped?
No method guarantees no periods, but, according to a 2014 articleTrusted Source in the International Journal of Women’s Health, you can suppress your cycle with various types of birth control such as:
Birth control pills. If you take daily birth control pills, after a year you’ll have about a 70 percent chance of suppressing your cycle.
Hormone shot. A hormone shot can affect your fertility for up to 22 months. After a year, you’ll have about a 50 to 60 percent chance of suppressing your cycle; about 70 percent after 2 years.
Hormonal IUD. One year with a hormonal IUD (intrauterine device) gives you about a 50 percent chance of suppressing your cycle.
Arm implant. With a birth control implant inserted in the upper arm, your chance of suppressing your cycle is about 20 percent after 2 years.
Not all women have periods
For a woman to have regular periods, the following need to be functioning properly:
Your period is a natural occurrence. It’s part of your body’s preparation for pregnancy. Every month that you don’t become pregnant, your body expels tissue that it no longer needs to nourish a fertilized egg.
If you experience inconsistencies such as a change in your menstrual regularity, frequency, duration, or volume, talk with your doctor or gynecologist.