What’s typical for you may not be the same as for someone else. And even your own period blood color may change from day to day or period to period.
This article looks at various period blood colors, what’s typical, and when they tend to occur. It also covers what period blood colors, levels of flow, and period frequencies may be cause for concern.
Bright Red Period Blood Color
When your period blood is bright red, it means that it passed through your vagina fairly soon after entering your uterus. You’re most likely to see bright red blood at the start of your period.
You may also see brighter blood at times when you have cramps. That’s because cramps occur when your uterus contracts, and contractions lead to heavier blood flow.
Dark Red, Brown, Black Period Blood Color
Older period blood can appear:
Darker redBrownBlack
These colors suggest a slower flow. For most people, the blood gets darker over the course of the cycle. This is because older blood from the deeper parts of the uterine lining is shed later.
Brown blood is also common in the weeks after you give birth. Postpartum bleeding is called lochia.
However, in some cases:
Dark red or brown blood may be an early sign of pregnancyBlack blood may be a sign of a vaginal blockage
If these colors are unexpected or abnormal for you, talk to your healthcare provider.
Pink Period Blood Color
It’s common for period blood to look pink at the beginning or end of your period when your bleeding is lighter. The color change comes from normal mucus mixing with the blood.
Pink blood during other phases of your cycle may be caused by:
Significant weight lossAn unhealthy dietAnemia
See a healthcare provider if you suspect any of these causes may be affecting your period blood. You may also benefit from seeing a nutritionist.
Orange, Gray, or Green Period Blood Colors
Orange period blood can be a normal outcome of cervical fluid mixing with blood.
Orange spotting not linked to a period may mean you’re pregnant. It can occur when a fertilized egg implants in the uterine wall. This takes place between about 10 and 14 days after conception.
However, orange, gray, or green tinges to your period blood or vaginal discharge are often a sign of infection, such as:
TrichomoniasisBacterial vaginosis (BV)Some sexually transmitted infections (STIs)
Other symptoms of an infection include:
Vaginal itching and discomfortDischarge with a bad odor, including a “fishy” smellPainful urination
See a healthcare provider if you have these symptoms. You may need an antibiotic to clear up the infection.
Consistency
Your menstrual blood may be thin and watery or thick and sticky. Thin and watery period blood is usually pinker, while thick and sticky discharge is usually more brown.
These changes in consistency are common at the end of your cycle. This is because most of the endometrial tissue already has been passed.
The thickness of your period blood is likely to change as you approach menopause because the uterine lining tends to build up less. This is also common when your hormones are affected by stress or too much exercise.
Clots
Period blood may contain some clots. During your period, the separation of the endometrium from the uterine wall can tear small blood vessels. They bleed, and clots form to stop the bleeding. They’re then passed out with your menstrual blood.
Clots can also form as hormonal changes signal the end of your period and the lining starts to build up again.
Period blood clots are generally small. If they’re larger than 1 inch in diameter, let your healthcare providers know. They may diagnose menorrhagia (heavy menstrual bleeding).
When to Call Your Healthcare Provider
Speak to your healthcare provider if you notice a potentially concerning period blood color or anything that is out of the norm for you.
Changes in your menstrual bleeding can be a symptom of another health issue, including polycystic ovary syndrome (PCOS). Not all of these conditions are serious or need medical attention, but a professional should weigh in.
Signs that you should see a healthcare provider about your period include:
Missed periods: Not bleeding for more than three months when you know you’re not pregnant Irregular periods: This includes periods that are too close together or far apart, as well as periods that last for longer or shorter than normal. (Having a lifetime of irregular periods isn’t a concern, however. ) Unexpected bleeding: Bleeding or spotting between periods Heavy bleeding: Normal periods can vary from one person to the next. But if you are bleeding so much and so quickly that you flood your menstrual products or need to change them more than once an hour, you should be evaluated. This is particularly true if you have a family history of a bleeding disorder or have ever had anemia. Clots in period blood that are >1 inch: These may be a sign of uterine or cervical fibroids, polyps, or cancer; a hormonal imbalance; endometriosis; miscarriage; or ectopic pregnancy. Severe pain during your period: This goes beyond the discomfort of typical menstrual cramps.
If you get a fever and feel unwell after using a tampon, it could be a sign of toxic shock syndrome. This is a rare but potentially fatal condition that requires immediate medical attention.
Summary
Period blood is a mixture of blood and tissues that lines your uterus. It has a different color and consistency than the blood in your veins.
Comes anywhere between every 24 day to 38 daysVaries as much as 20 days over the course of the yearLasts between four-and-a-half to eight daysIncludes between 5 milliliters (ml) and 80 ml of blood
When it passes from the vagina, your period blood color may be pink, red, brown, black, or even other colors. It may change colors during the same period. It can be thin or thick. Blood clots that pass during your period may be normal or they may signal another health issue.
It’s important to know what’s normal for you. Talk with your healthcare provider if you have concerns about changes in your period.
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