How Many Days Should You Bleed During Your Period?

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To some extent, most women wonder if their menstrual cycle is normal. It’s a natural question that you may encounter, too, especially if your menstrual cycle varies in length from one month to the next.

A normal period can last from one to seven days. Most women with regular menstrual cycles have cycles that last an average of three to five days.

It’s completely normal for your menstrual cycle to change slightly. You should watch out for extreme cases, i.e. very light or very heavy periods.

They could be a sign of an underlying health problem. And excessive bleeding can lead to anemia (low red blood cell count).

This article defines what “normal” menstruation is and the three factors most likely to affect the length of a normal period. It also explains what prolonged and/or heavy menstrual cycles are and why you should be wary of them.

Verywell / Cindy Chung

Normal menstrual period

Your period occurs when the lining of your uterus is shed. The cycles are triggered by ovulation or when an egg is released from the ovary.

Usually, if you haven’t gotten pregnant in one cycle, your period should come 14 days after you ovulated.

Many women “compare the notes” about their periods. But every person is different, and so is their menstrual cycle.

However, it’s not normal for you to bleed for more than seven days per month or not bleed once you’ve passed your period. This is the official name for the onset of menstruation at puberty.

See your healthcare provider if your period lasts longer than seven days.

A long period of time or more

Heavy bleeding is a sign to contact your healthcare provider. (One cycle is fine, but not two or three.) So what does “heavy” mean?

  • Soak one or more tampons or pads every hour for several hours in a row
  • Wear multiple pads at once to absorb blood
  • Having to change tampons or tampons overnight (bleeding time usually slows down)
  • Menstruation that includes a blood clot that is 1/4 or larger in size

Factors affecting cycle length

Several factors can affect the length of your period:

Medical conditions

Medical problems that change the thickness of the endometrium (the lining of the uterus) or the number of blood vessels inside it plays a role in how many days your menstrual cycle lasts.

This is because your menstrual flow includes the shed endometrium, as well as blood from small vessels that are subsequently exposed.

Multiple and/or long periods of time can be a sign of:

It is understandable that the thought of some of these conditions can trigger fear. See your health care provider if you have heavy or prolonged periods, so they can find the cause and treat it.


During the first few years after your period begins, you may experience unpredictable bleeding. Reason? Maybe you still haven’t ovulated regularly.

Ovulation requires a complex interaction between the brain, ovaries, and hormones. It may take some time for your body to return to equilibrium.

After their first period, some people bleed more than the average number of days and/or skip several periods in a row. Menstruation is usually normal for about three years.

You may have irregular periods near the end of your reproductive years (sometime in your 40s). This is called perimenopause, or the menopausal transition.

This is the time when estrogen production begins to decline. As estrogen levels drop, there is less build-up of the lining of the uterus. Menstruation is lighter, shorter, and may even be irregular.

Birth control

Most women report having lighter and shorter periods when they use birth control. And this applies to both combined hormonal contraceptives — those that provide both estrogen and progesterone — and progesterone-only contraceptives.

This happens because the synthetic hormones in birth control overwrite the hormones produced by the ovaries.

Combined hormonal contraceptives include:

  • Birth control pills
  • Contraceptive patch
  • IUD

Progesterone-only methods include:

  • Some IUDs (IUDs like Mirena)
  • Contraceptive implant (eg Nexplanon)
  • Injectable birth control pills (such as Depo-Provera)

As you might have guessed, women who have frequent or heavy periods are sometimes prescribed birth control pills to control them.


The “normal” period lasts from one to seven days, with the average period lasting three to five days. You’ll soon realize (if you haven’t already), that what’s normal for you may not be normal for a close friend or family member. So focus on any changes in your own cycle.

Medical condition, age, and birth control methods can affect the length and intensity of your period. Heavy or prolonged periods can be a sign of a problem. Take note and call your doctor if you have multiple episodes in a row.

A very good word

When it comes to menstruating, there is a small amount of what is considered normal in terms of timing and frequency. Once you’ve started menstruating, discuss any changes in your cycle with your healthcare provider. In particular, there are two changes worth sharing: if your period is late or if your period lasts more than seven days.

frequently asked Questions

  • How long does a normal period last?

    Normal varies from woman to woman, but in general, a cycle lasts from one to seven days. On average, most women menstruate for 3-5 days.

  • Is it normal to have a longer or shorter period?

    A woman’s menstrual cycle can vary from cycle to cycle. It’s perfectly normal to have a period one or two days longer or shorter than usual, as long as it lasts less than seven days.

  • How long should a teenage girl’s period last?

    A teenage girl’s period will likely be light during the first few menstrual cycles and last only a few days. Once cycles begin to become regular, they will likely last three to five days, although they can be as short as two days or as long as a week.

  • Is an eight-day period normal?

    No, a period cannot last more than one week. If it happens only once then it’s probably not something to worry about. However, if your menstrual cycle lasts longer than a week, you may be at risk for iron-deficiency anemia. Talk to your gynecologist if your period lasts for eight days or longer.

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