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  • Writer's pictureGrace Health

Reasons Your Period Blood Is Black

If there’s something that’s not often discussed when it comes to the menstrual cycle is black period blood. You probably might have freaked out a bit the first time you noticed it. But don’t worry, it’s not necessarily a cause for concern. In fact, your period blood can come in a range of colours and consistencies, and black is just one of them. And while it’s not a topic that we may love to talk about, it’s important to know what’s happening with our bodies during our menstrual cycle. So, in this blog post, we’ll dive into the reasons why your period blood may be black, and when it’s cause for concern.

Reasons your period blood is back

Reasons for black period blood:

What causes it?

Menstrual Blood That Has Been Retained

One of the most common reasons for black period blood is menstrual blood which has been retained in the uterus for a longer period of time. Menstrual blood usually appears red or brown due to the presence of oxygen, which causes the blood to oxidize. However, when the blood is retained in the uterus for a longer period of time, the lack of oxygen causes the blood to turn black. This can occur if you have a light flow or if your cervix is closed during your period.

Hormonal Imbalance

Hormonal imbalances can also cause black period blood. Hormones such as estrogen and progesterone play a vital role in regulating your menstrual cycle. When these hormones are imbalanced, they can cause changes in the thickness of your uterine lining, leading to irregular periods and abnormal bleeding. This can also cause the blood to appear black or dark brown.


Endometriosis is a condition where the tissue that normally lines the uterus grows outside of it, causing abnormal bleeding and pain. Women with endometriosis may experience black or dark brown period blood, as well as other symptoms such as cramping, back pain, and heavy bleeding. If you suspect that you may have endometriosis, it’s important to speak with your healthcare provider to discuss treatment options.

Polyps or Fibroids

Polyps and fibroids are growths that can develop in the uterus, causing abnormal bleeding and pain. Polyps are small, non-cancerous growths that develop on the lining of the uterus, while fibroids are larger, more solid growths that can develop inside or outside the uterus. Both of these conditions can cause black or dark brown period blood, as well as other symptoms such as heavy bleeding and cramping.


Infections such as bacterial vaginosis and sexually transmitted infections (STIs) can also cause black period blood. These infections can cause inflammation and irritation of the cervix and uterus, leading to abnormal bleeding and discharge. If you suspect that you may have an infection, it’s important to speak with your healthcare provider to discuss treatment options.

When to Seek Medical Attention

While black period blood is not always a sign of something serious, there are some instances where it may require medical attention. If you experience any of the following symptoms, it’s important to speak with your healthcare provider:

  • Heavy bleeding

  • Severe cramping

  • Foul-smelling discharge

  • Fever or chills

  • Pain during sex

In conclusion

Black period blood is not uncommon, and there are many reasons why it may occur. Understanding the underlying causes can help you make informed decisions about your menstrual health. If you experience any unusual symptoms or have concerns about your menstrual cycle, don’t hesitate to speak with your healthcare provider. Remember, your menstrual cycle is unique to your body, and changes in the colour, texture, or flow can be normal.

Stay informed, stay in control Hope this helps.

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10 commentaires

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4 days ago

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Dana Stjernfelt
Dana Stjernfelt
11 juil.

Normally when I have my period, the blood is usually a darker color, even at the beginning. But recently, I had this weird dream of bleeding from private area and ever since then, my period blood has actually been a lighter color. Do you think that's just a coincidence or what could it mean?


smith aurora
smith aurora
11 juil.

This is such an informative post! It's great to see more open discussions about menstrual health. I remember the first time I noticed black period blood, and it was definitely alarming. pizza tower


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03 juil.

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23 juin

This is such an informative post! Understanding why period blood can be black helps alleviate unnecessary worries. Turkish Evil Eye. Thanks for addressing this often overlooked topic and providing clear explanations. Very helpful!

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