When is Normal and Why Does It Happen


  • Brown period blood is normal when it is at the beginning or end of your period.
  • But you should see a doctor if you also experience unusual pain, a foul odor, or blood clots.
  • If you have brown blood between your periods, then this could be a sign of PCOS.
  • Visit the Insider Health Reference Library for more tips.

The blood of the period is not always red – it can range from light pink to dark black brown.

Brown period blood is usually not a cause for concern, but if it occurs between your periods or with other symptoms such as a bad odor, this may be a sign of a medical problem.

Here’s what you need to know because your period blood is brown and when you need to see a doctor.

Blood from the brown period may be normal

We usually think of blood as light red, but “blood becomes darker when it has time to oxidize,” he says. Christine Greves, MD, a gynecologist at Winnie Palmer Hospital for women and children.

This is why the hemoglobin in your blood it turns brown when exposed to oxygen – and can happen when blood stays in your uterus for a long period of time. “It’s basically blood that’s not so‘ fresh, ’” Greves says.

There is usually no cause for concern. Here’s one few normal reasons because you can see the blood of the brown period:

  • Beginning of the period. At the beginning of your cycle, you may see a remnant of blood from your last period that has been in your uterus and appears brown.
  • End of period. At the end of your cycle, you may see brown blood because the blood has spent more time sitting in your uterus before leaving your body.
  • Light period. If you tend to have light periods, you are even more likely to see brown blood during your period. This is because a flow of light means that the blood leaves your body more slowly, giving you more time to oxidize.

There are also a few other reasons connected without period so that you can experience a brown blood flow:

  • Menopause. You may also see brown or discharge blood after menopause. This is because as your estrogen levels drop, the lining of your uterus and vagina may shed and become thinner.
  • First pregnancy. Brown blood can appear very early in pregnancy. When a fertilized egg sticks to the lining of your uterus, you may have it blood implantation. This bleeding is lighter than a typical period and may be brown.
  • After pregnancy. If you have given birth in the last six weeks, your body will continue to get rid of blood and tissue from your uterus. This flow may be brown.

When bleeding from the brown period can be a cause for concern

When brown blood occurs between your periods, it may be a sign of an underlying medical situation such as polycystic ovary syndrome (PCOS). SOP occurs when your body produces too much testosterone, causing your larger ovaries to grow and develop abnormal growth.


The PCU can too stop your ovaries from releasing the eggs. When this happens, your uterus grows its normal lining, but then does not leave it with the usual process of your period. However, you may have particularly mild periods and see bleeding between periods with old, brown or runny blood.

Brown blood is not usually a major cause, but Greves advises that you should call your doctor if you experience any of these symptoms with brown blood:

  • You have unusual pain.
  • You’re bleeding for more than a pad per hour.
  • Your blood or discharge has a bad odor.
  • Your period lasts longer than usual.
  • Pass blood clots larger than a quarter.

Take away the Insider

It is normal to see brown blood during your period, especially at the beginning or end of your cycle.

But if you have abnormal symptoms with brown blood, or see between periods, consult your doctor to check if you have an underlying medical problem.

“Just because brown blood isn’t uncommon, doesn’t mean it should be ignored,” Greves says.

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