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Menstruation happens about once a month, as a normal part of the menstrual cycle.

Menstruation happens about once a month, as a normal part of the menstrual cycle.
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Menstruation (periods)

Menstruation affects pretty much every woman. This information will help you understand your menstrual cycle.

What is menstruation?

Menstruation is bleeding from the vagina that happens about once a month, as a normal part of the menstrual cycle. It is also known as having a period.

During this cycle, your hormones make the lining of the uterus become thicker, getting ready in case of pregnancy. Hormones also cause an egg to be released from an ovary, which is known as ovulation.

If you don’t become pregnant, then your periods starts about two weeks after ovulation. The lining of the uterus falls away and, along with some blood, flows out through the vagina. Periods can be light or heavy, and the blood can range from bright red to dark brown. You might also notice small clots.

Some women get symptoms leading up to and during menstruation, such as:

When do periods typically start?

Girls have their first period during puberty. Most often, that is at age 12 or 13 years old, but girls can start menstruating as young as 9, or as late as 16.

What problems can women have with their periods?

Problems with periods can include:

When might periods stop?

Periods stop during pregnancy, and often while you are breastfeeding.

Some women find their periods stop for a time because of long-term illness, low body weight, stress, lots of strenuous exercise and hormone problems.

Some medications, such as contraceptives, might stop your period. This can be helpful for some women, especially if their periods are heavy or painful.

Sometimes after stopping the pill or other contraceptive, it can take a while for your periods to come back.

Periods stop altogether when women reach menopause – the average age is 51-52.

When should I see a doctor?

You should talk to your doctor if:

  • you are 16 years or older and haven't started to have periods
  • your periods are getting heavier
  • your periods get much closer together or further apart
  • your periods have stopped and you’re not sure why
  • you are bleeding in between periods or after sex
  • you are bleeding after menopause
  • you have severe period pain.

You can also talk to your doctor if, for any reason, your periods are affecting your wellbeing or enjoyment of life.

More information

Learn more about the menstrual cycle on Jean Hailes for Women’s Health website.

Last reviewed: July 2016

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