Decoding Period Blood Colors: What They Reveal About Your Health

In our society, discussions about menstruation often come with a hint of taboo, yet they are crucial conversations for the health and well-being of half the population. Today, we’re diving straight into a topic that many people wonder about but rarely discuss openly: menstrual blood color. From the subtle nuances to what’s considered normal, let’s shed some light on this natural aspect of a woman’s life.

Many parts of reproductive health and menstruation are not discussed enough. Such as how can you tell the difference between regular discharge vs pregnancy discharge? How are you supposed to know what is normal?  Period blood comes in a range of colors, from those true reds to blacks, pinks, and even oranges. Whether you’re concerned about an unusual menstrual shade or are just curious about interpreting your period blood, clarifying period blood color meaning can be a useful way of understanding your reproductive health.

Here, we examine what your menstrual blood color might be telling you and what to do if you notice something’s off.

What color is “normal” period blood?

Most women menstruate between the ages of 12 to 52. Over those four decades, countless irregularities and surprises in periods can crop up, from the timing of your menstrual cycle to the shades that show up in your underwear.

Healthy or “normal” period blood could be:

• Bright red
• Dark red
• Brown
• Black
• Pink
• Light Pink
• Orange

Much of the time, your period color indicates the nature of your flow itself, like how quickly or slowly blood is leaving your uterus. On other occasions, unusual-looking period blood—or seeing changes in menstrual bleeding that depart dramatically from your usual flow—could signal a new or underlying health condition, like an infection.

Though period color alone isn’t usually enough to diagnose a health issue, it’s a good idea to keep an eye out for other symptoms or menstrual bleeding irregularities. Then, it’s best to reach out to your primary care provider or OBGYN for a full and thorough assessment.

Decoding Period Blood: What Certain Shades Could Say About Your Reproductive Health

If you’ve ever had a period, you know that period blood doesn’t look like the blood you see when having your blood drawn at your annual. Period blood is made of various substances, including:

• Blood
• Endometrium (the tissue lining of your uterus)
• Cervical and vaginal secretions (mucus

If you looked at period blood under a microscope, you’d also find bacteria known as vaginal flora. Your vagina is host to a whole ecosystem of bacteria (dominated by Lactobacillus) that help keep your vagina healthy, clean, and low-pH—a key factor in making it hospitable to sperm.

In total, each of these constituents can contribute to the color of your period blood. Below, we track what each hue could mean and what to do (if anything) if you notice it.

Black or Dark Brown Period Blood

Though it can certainly look a bit ominous, dark red, brown, or black period blood is usually perfectly normal. Typically, dark red period blood simply a sign that the blood you’re shedding has oxidized (oxidation is a chemical process that occurs when the substances in your flow meet the air). By extension, this can also mean your uterus is cycling out “old” blood—blood has taken a longer time to exit your body, signaling a slower menstrual flow.

If you’re noticing especially dark period blood or brown period blood, you may only see it towards the end of your period. Typically, this means old blood and tissue are passing from the farthest reaches of your uterus (for many people, the first blood and tissue shed come from areas near the front of the uterus).

In rarer cases, black period blood could indicate a deeper issue, like an obstruction in your vagina. If dark brown blood or black blood is new to you or if you experience symptoms like painful abdominal cramps, it’s a good idea to reach out to your healthcare provider for evaluation. To distinguish between period and early pregnancy cramps, pay attention to the type and timing of the pain, as well as any accompanying symptoms.

Bright Red Period Blood

A bright “crimson” or red color typically indicates blood is moving out of your uterus and vagina at a steady pace. You’re most likely to notice bright red blood at the start of your cycle, though many women find it consistent throughout their menstruating days.

However, it’s possible to have a reproductive disorder even if your period blood appears a “healthy” red.

Although it’s fairly typical to notice more abdominal cramps coupled with bright red blood (a sign your body is working hard and efficiently to pass endometrial tissue), a heavy flow coupled with especially painful abdominal cramps could also indicate another condition, such as:

• Endometriosis
• Adenomyosis
• Fibroids or polyps
• Pelvic inflammatory disease (PID)

If your period blood is a true red but you’re still struggling with period pain, you don’t need to ignore your other symptoms. A healthcare provider can help evaluate your symptoms to see if another issue could be causing your distress.

Pink Period Blood

For many women, light flows mean light colors. Pink or rose-colored blood and pink discharge usually indicate that less blood is flowing than usual. As a result, the traditional red hue is diluted, making it appear as a watery period colo, such as pink or light pink. As an example, pink period blod is a common color to notice when you’re spotting between periods.

However, if you’re noticing a rosy color during your period, it could also indicate a hormonal imbalance—specifically, lower-than-average estrogen levels. In your monthly cycle, estrogen is responsible for cueing your ovaries to release a mature egg (ovulation) and add density to your uterine lining. When estrogen is low, you might experience:

• Anovulation – Where no mature egg is released from your ovaries (no ovulation)
• Amenorrhea – Absence of a period
• An extremely light period flow – Lending itself to very light period blood colors

Using hormonal oral contraceptives (like the pill or the mini pill) can cause low estrogen in the body. For this reason, many women who use this birth control method experience very light periods accompanied by light period blood colors.

Orange Period Blood

Orange period blood may result when the reds of your menstrual flow mix with what can appear like a yellowish or opaque vaginal and cervical discharge.

However, there are occasions when orange period blood may indicate a separate health condition, such as:

• An STI – STIs are very common, and many of them may present with vaginal discharge in abnormal colors (yellow, green, and gray among them). If your unusually colored period blood carries a foul smell or you experience pain during urination or having sex, it’s a smart idea to get an STI screening.
• Another infection – Orange vaginal discharge can sometimes indicate an imbalance in your vaginal flora, which can result from a bacterial infection. For instance, BV (bacterial vaginosis) discharge tends to be white, gray, or even green.

While BV isn’t considered an STI, it can make you more susceptible to contracting one. If you notice itchiness, a bad smell, or a burning sensation when you pee, it’s a good idea to seek out a healthcare provider for treatment.

Gray Period Blood

If your period blood is gray, it’s not a sign to ignore. Gray period blood or discharge usually indicates a health problem that requires treatment from a provider. It could be a sign of:

• Infection – As mentioned, bacterial infections like BV can arrive with a grayish discharge.
• Miscarriage – Sometimes, grayish blood and tissue passing with your period can indicate a miscarriage. Heavy bleeding or a “sandy” appearance of lost blood are also common signs of miscarriage, which can happen in the first trimester.

If you’ve been sexually active or trying to conceive with a partner, consider reaching out to a healthcare provider. They can run an ultrasound and test your hCG levels to evaluate whether your period shedding is caused by miscarriage.

• A foreign object in your vagina – While finding something in your vagina can feel scary, it happens more often than you might think. For instance, it’s common to insert a tampon and forget about it, especially if the tampon has traveled further up the vaginal canal (which can happen if you’ve had sex without removing it). Often, this can cause:
  • Fluid “leakage” that has a muddy color—often gray, black, or brown
  • A foul odor
  • Itchiness or rash around the vagina or vulva

If you think you have a foreign object in your vagina—whether a tampon, a condom, or something else—it’s very important to see a provider as quickly as possible. They can help you remove it and ensure the lost object hasn’t caused physical damage or put you at risk of an infection.

Understanding AUB (Abnormal Uterine Bleeding)

Noticing any changes to your monthly cycle could be characteristic of AUB, or abnormal uterine bleeding. While it’s not a diagnosable health condition, AUB describes any bleeding patterns that diverge from clinical benchmarks for “normal” periods.

These include:

• Cycle length – Bleeding for 8 days or fewer.
• Cycle timing – Getting your period every 24 (at least) to 38 (at most) days. Irregular cycle lengths are fairly normal, but they shouldn’t deviate by more than 7 to 9 days.
• Your flow – Your flow shouldn’t be so heavy that you’re bleeding through pads or tampons quickly. It also shouldn’t be so light that you only notice spotting or pink blood.
• Absence of spotting – Unless you’re using a hormonal contraceptive like the pill, shedding blood between periods is still considered unusual. If doing so is typical for you, you may want to reach out to a healthcare provider.

It’s important to recognize that period symptoms and trends vary widely between individuals, but each person’s period “pattern” tends to be consistent over time.

If you notice any sudden changes from your norm, don’t hesitate to reach out to a trusted provider. Whether it’s correcting a hormonal imbalance or getting treated for an underlying health condition, doing so could help support your reproductive and overall health for the long haul.

Demystify Your Reproductive Health with SneakPeek

Without a doubt, periods are a vital marker of women’s health—and when you’re trying for a baby, it’s crucial to learn to read the cues your body is sending you.

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You’ll take your gender blood test sample at home, send it to SneakPeek labs, and we’ll triple-review your results and return them on the same day they’re received. We’ll even create a complimentary downloadable report you can share with your healthcare provider. Find out why SneakPeek Test is the #1-recommended at-home early gender test, trusted by over 1 million moms, by visiting us today.

Editorial Policy

At SneakPeek, our commitment is to provide accurate, up-to-date, and reliable information to empower our readers. Our content is thoroughly researched, reviewed by medical experts, and fact-checked to ensure its credibility. We prioritize the well-being and education of our readers, and our editorial policy adheres to the highest standards of integrity and accuracy in all our articles.

This post has been reviewed for accuracy by the following medical professional:

Dr. Heather Soper, Certified Nurse Midwife

Dr. Heather Soper brings over 15 years of experience in women's health and obstetrics to her role as the owner of The Genesis Resort for Birth. Complementing her clinical practice, she serves as an Assistant Professor of Nursing at James Madison University, where she educates nursing students with a focus on compassionate, patient-centered care. Her advanced training and dedication to midwifery are evident in her contribution to both academia and the wellness of expectant mothers.

Sources:

1. Bustle. 17 ‘Clueless’ Terms Translated Into Today’s Slang. https://www.bustle.com/articles/54477-17-clueless-terms-translated-into-todays-slang-because-a-baldwin-doesnt-make-sense-anymore
2. Office on Women’s Health. Your menstrual cycle. https://www.womenshealth.gov/menstrual-cycle/your-menstrual-cycle
3. National Library of Medicine. Proteomic Analysis of Menstrual Blood. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3494145/
4. National Library of Medicine. The Female Vaginal Microbiome in Health Bacterial Vaginosis. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8058480/
5. Northwestern Medicine. What Your Period Says About Your Health – Flow, Color, Timing and More. https://www.nm.org/healthbeat/healthy-tips/what-your-period-says-about-your-health
6. Verywell Health. Period Blood Color and Consistency. https://www.verywellhealth.com/what-does-menstrual-blood-look-like-2721937
7. Mayo Clinic. Menstrual Cramps. https://www.mayoclinic.org/diseases-conditions/menstrual-cramps/symptoms-causes/syc-20374938
8. Healthline. Black, Brown, Bright Red, and More: What Does Each Period Blood Color Mean? https://www.healthline.com/health/period-blood#pink
9. Cleveland Clinic. Estrogen. https://my.clevelandclinic.org/health/body/22353-estrogen#function
10. Mayo Clinic. Bacterial vaginosis. https://www.mayoclinic.org/diseases-conditions/bacterial-vaginosis/symptoms-causes/syc-20352279
11. Verywell Health. Miscarriage or Period: How to Tell the Difference. https://www.verywellfamily.com/what-does-an-early-miscarriage-look-like-2371235
12. Mayo Clinic. Is my period “normal”? Is it OK if it’s not? https://mgrcpress.mayoclinic.org/women-health/is-my-period-normal-is-it-ok-if-its-not/