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Blackish Blood During Periods: Causes and Solutions Explained

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Have you spotted a thick black clump of blood just lurking on the top of your pad? Has it sent you into a frenzy of mad Google searches? "Why is my period blood black and thick?" "Is black bleeding in period normal?" and whatnot! And Google came up with a list of cancers and tumours. Now, your head hurts just thinking about which of these cancers listed you are going to be diagnosed with.Well, this would never happen with RIO Heavy Flow Pads! Because RIO Heavy Flow Pads have a super absorbent core that absorbs everything, yes, even blood clots! But let's now talk about the big problem! Thick, blackish blood during periods might seem out of the blue, but it is in fact, more common than you might think. Let's find out all about it in this blog.

Understanding Black Period Blood

First things first, what exactly is black period blood? Well, it's essentially blood that appears darker and thicker than the usual red flow we're accustomed to during menstruation. While it may seem alarming at first glance, it's often nothing to be overly concerned about.Black bleeding in your period typically occurs at the beginning or end of your menstrual cycle. It's essentially older blood that has taken longer to exit your body. As blood ages, it oxidises, turning darker in colour. Hence, blackish blood during periods is essentially just older menstrual blood making its grand exit.Now that you understand why you might experience black bleeding during your period, let's talk about managing your menstrual flow comfortably.Meet RIO Heavy Flow Pads, your reliable companion for those heavy flow days. These super-absorbent pads with XXL coverage with double wings ensure complete protection, keeping you dry, rash and irritation-free throughout your cycle. These pads absorb all sorts of blood clots so the top remains dry and comfortable. You can go with RIO Cottony Soft or Comfort Weave Pads during lighter flow days of periods.

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Common Causes of Black Period Blood

Now, let's dive into black blood in period reasons:
  • Slow Flow: Sometimes, your menstrual flow may be slow, causing the blood to linger in the uterus longer than usual. As a result, it oxidises and turns black before finally making its way out.
  • Uterine Lining Shedding: During your period, your uterus sheds its lining, which comprises blood and tissue. If the shedding process is slow, the blood may darken before it's released from the body.
  • Hormonal Changes: Fluctuations in hormone levels can also impact the colour and consistency of your menstrual blood. Certain hormonal changes, particularly those related to birth control or menopause, can contribute to black bleeding in the period.
  • Endometriosis: In some cases, black bleeding in the period may be a symptom of endometriosis, a condition where tissue similar to the lining of the uterus grows outside the uterus. This condition can cause dark, thick menstrual blood, among other symptoms.

When to See a Doctor

While black period blood is often harmless and nothing to be overly concerned about, there are instances where it's advisable to seek medical attention:
  • Persistent Changes: If you consistently notice blackish blood during periods for several cycles or if it's accompanied by other concerning symptoms such as severe pain, irregular periods, or abnormal discharge, it's important to consult your healthcare provider.
  • Suspected Endometriosis: If you suspect you may have endometriosis or have been diagnosed with the condition and experience black period blood along with other symptoms, it's crucial to discuss your concerns with your doctor.


Black period blood may seem unusual, but it's often just a natural variation in menstrual flow. Remember, your menstrual cycle is unique to you, and changes in colour, texture, or flow are often normal. However, it's always important to listen to your body and seek guidance from your healthcare provider if you have any concerns or experience unusual symptoms.


How do you stop black period blood?

Treatment for black bleeding in the period may involve managing hormonal imbalances or addressing other health issues. Ensure you consult your gynaecologist and avoid self-diagnosis to stop prolonged black-period blood.

Can PCOS cause black periods?

Yes, PCOS (Polycystic Ovary Syndrome) can cause hormonal imbalances leading to irregular periods, including the presence of dark or black period blood. Read the blog to understand other common causes of black period blood.

Is dark period blood good or bad?

Dark period blood is generally normal and can be caused by older blood being discharged from the uterus. However, persistent changes should be discussed with a healthcare provider to rule out underlying issues.

How long does the black period last?

Period duration can differ from woman to woman. The duration of black period blood varies based on its cause. In case of prolonged black bleeding for a period, consult a healthcare professional to determine the underlying issue and receive appropriate treatment.

Can dark periods cause infertility?

While dark period blood itself is unlikely to cause infertility, underlying conditions leading to changes in menstrual blood may affect fertility. Consult with a healthcare provider to address concerns about fertility and explore appropriate interventions if necessary.


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