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What Your Menstrual Blood Color Says About Your Health: Is Black Normal?

Gangnam Clear Dental Clinic · 강남클리어치과 · January 10, 2025

If you are a woman of reproductive age, you experience menstruation once a month. A regular menstrual period and amount generally indicate that the uterus is in a healthy state. If...

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This page is an English translation of a Korean Naver Blog archive entry. For exact wording and source context, verify against the Korean archive original and the original Naver post.

Clinic: Gangnam Clear Dental Clinic

Original post date: January 10, 2025

Translated at: April 20, 2026 at 5:26 PM

Medical note: This translation does not guarantee medical accuracy or suitability for treatment decisions.

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If you are a woman of reproductive age, you experience menstruation once a month. A regular menstrual period and amount generally indicate that the uterus is in a healthy state.

If your period is outside the usual time or the color of your menstrual blood seems unusual, it is a good idea to pay attention again to your uterine health. Some of these changes may be temporary and not something to worry about, but others may require medical care. Today, we will look at uterine health according to menstrual blood color and briefly discuss whether black menstrual blood is normal.

Health According to Menstrual Blood Color

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Menstrual blood color is an important indicator that can show the condition of a woman’s uterine health. If you are a woman, it is a good idea to check the condition of your menstrual blood regularly. Uterine health according to color can be thought of as follows.

Normal Menstrual Blood

  • Bright red: This indicates the healthiest state. It can be seen when female hormone levels are appropriate and blood circulation is smooth.

  • Light pink: This is normal if it appears at the beginning of your period. It is a sign that menstruation has started and not much blood has been discharged yet.

  • Dark brown: Dark brown menstrual blood that appears near the end of a period is normal. This is because residual blood that remained in the uterus is being discharged. If it appears at the beginning of a period, it is likely blood left over from the previous period.

Dark purple

This is a color that can be seen when menstrual bleeding is temporarily heavy. However, if menstrual blood consistently appears dark purple, it may be worth suspecting a gynecological condition such as uterine fibroids or adenomyosis.

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Grayish red

If your menstrual blood is grayish red, pay attention to how long it lasts. If it continues for about 2 to 3 months, it may be a sign of polycystic ovary syndrome or perimenopause.

Orange menstrual blood

If your menstrual blood is orange, there may be a possibility of a vaginal infection. In this case, itching of the vulva and an unpleasant odor may also occur. Vaginitis is not good for uterine health if left untreated, so it is advisable to receive appropriate treatment.

Is Black Menstrual Blood Normal?

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Finally, the symptom that causes the most concern is when menstrual blood appears black.

If your menstrual blood is black, it may first be a sign that blood circulation in the uterus is poor.

Another possible reason is a uterine condition.

If black menstrual blood continues throughout the premenstrual period, uterine adenomyosis, uterine fibroids, or endometrial disease may be suspected.

Other possible causes include stress or environmental hormones.

In particular, if you have taken oral contraceptives or hormonal medications used to control hormones, menstrual blood may appear black.

Black menstrual blood mixed in toward the end of a period is a natural part of the menstrual process, as old blood is being discharged. However, if menstrual blood continues to appear black and symptoms such as worsening menstrual cramps or abnormal bleeding occur, it is best to identify the cause with a medical professional.

Seek medical care in these cases

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So far, we have looked at uterine health according to the color of menstrual blood. Because the uterus can be easily affected by stress and environmental changes, these can also affect menstruation. That is why temporary irregularities can happen in many cases.

If you have light pink bleeding even though it is not your period, if there are many clots in your menstrual blood, or if severe cramps occur during your period, it is advisable to have a gynecological examination.

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