Period Blood Color Chart: What Different Colors Mean
Period blood color can shift from pink to bright red, brown or even black, and most of the time that is perfectly normal. This guide explains what each shade means, why it changes, and which colors are worth showing a doctor.
You glance at a pad or tampon and the color is not what you expected. One day it is bright red, the next it is brown or almost black. It is one of the most common things people wonder about their periods, and the good news is that the answer is usually reassuring.
Color mostly shows how long the blood has been in your body, along with how fast it is flowing. A period calculator helps you log each cycle, and it is worth knowing what causes menstrual bleeding in the first place so the shades make sense.
Key Takeaways
- Pink, bright red, dark red, brown and black period blood are all usually normal.
- Color mostly reflects how long blood has been exposed to air (oxidation) and how fast it flows.
- Brown or black blood is typically older blood, often at the start or end of a period.
- Orange, gray or green discharge, especially with a foul smell, itching or pain, deserves a doctor visit.
- Small clots are common. Large or frequent clots with heavy bleeding should be checked.
What Is a Normal Color for Period Blood?
Normal period blood can range from light pink through bright red and dark red to brown, and sometimes black. Your color can change from day to day and even between cycles, and your usual pattern is the best baseline.
Quick answer: pink, red, dark red, brown and black period blood are usually normal. Orange, gray and green are the colors that most often point to a problem, especially with odor, itching or pain.
Why Does Period Blood Change Color?
Period blood is a mix of blood, bits of the uterine lining and vaginal fluids. The main reason the color shifts is oxidation: when blood meets oxygen, it darkens, much like a scab on your skin. Cleveland Clinic describes the same process.
Speed matters too. Fresh blood that leaves quickly looks bright red. Blood that waits in the uterus or vagina, such as overnight or at the end of a period, has more time to oxidize and looks darker. Mixing with clear cervical fluid can also make blood look pink, and hormones and flow can change from one cycle to the next.
The Period Blood Color Chart
Use this chart as a quick guide. It shows what each color usually means and when it tends to appear, and the sections below explain each one.
Understanding Color Variations
Here is what each shade usually means, color by color.
What causes pink period blood?
Pink usually means a small amount of blood has mixed with clear cervical fluid, which dilutes the color. It is common at the very start or end of a period and with a light flow. Light pink spotting in the middle of your cycle can also happen around ovulation, which our guide on ovulation bleeding vs period explains. Pink blood after unprotected sex around your expected date is worth a pregnancy test.
What causes bright red period blood?
Bright red is fresh blood leaving the body quickly, so it most often appears on the heavier days. For many people it is the main color of a healthy, active flow. If bright red bleeding soaks through protection every hour or two, read about heavy periods.
What causes dark red period blood?
Dark red is blood that sat a little longer before leaving. It often shows up in the middle or later part of a period, or after you have been lying down, such as first thing in the morning. It is a normal shade for most people.
What causes brown period blood?
Brown is older blood that has oxidized, and it is one of the most searched colors. It often appears at the start (leftover blood from the last cycle), at the end as flow slows, or with a light flow. Brown can be normal during your first periods too, as covered in our first period guide. Brown spotting that appears often between periods should be mentioned to a doctor.
What causes black period blood?
Black can look alarming, but it is usually blood that stayed the longest and oxidized the most, often at the very end of a period. It can also be a sign of blocked flow, in rare cases. See a doctor if black discharge comes with a foul smell, pain, fever or lasts for days.
What causes orange period blood?
Orange is often blood that has mixed with cervical fluid, so it can be a normal variation. But orange discharge with a strong smell, itching or burning can point to an infection such as bacterial vaginosis, so get it checked if those signs appear.
What causes gray period blood?
Gray is the color doctors take most seriously. It can be linked to bacterial vaginosis or another infection, and in rare cases to tissue passing during an early pregnancy loss. If you see gray discharge or tissue, especially with pain, bleeding or a possible pregnancy, contact a healthcare professional promptly.
Color Change During a Period
Many people notice a pattern across one period: lighter pink or red at the start, brighter red on the heaviest days, then darker red, brown or black as the flow tapers off. This matches how fast the blood moves out. Knowing how long a period lasts for you helps you place each shade in context.
Across your whole cycle, spotting that is pink or brown around ovulation or just before a period is common, and you can compare it with our guide on spotting from a real period.
Clots in Period Blood
Small clots are common, especially on the heaviest days. They form when blood pools and thickens before it leaves, and they usually look dark red or jelly-like. Clots smaller than about 2.5 cm (around the size of a coin) are generally not a concern.
See a doctor if you pass clots larger than about 2.5 cm, pass clots often, soak through a pad or tampon every hour or two, or feel dizzy or breathless. These can be signs of heavy periods, fibroids or other causes. The NHS page on heavy periods explains when to get help.
Other Potential Discharge Colors
Not everything you see around your period is blood. Between periods, discharge can change color too.
| Color | What it may mean | What to do |
|---|---|---|
| White or cloudy | Normal discharge, especially before a period | Nothing, unless it is lumpy, itchy or smells strong |
| Clear and stretchy | Fertile cervical mucus, common near ovulation | Nothing needed |
| Yellow | Can be normal when mild, but pale yellow-green with odor can be an infection | See a doctor if it has a strong smell or itching |
| Green | Often linked to an infection such as trichomoniasis | See a doctor |
| Gray | Often bacterial vaginosis | See a doctor |
Abnormal Colors and Warning Signs
Most color changes are harmless. Contact a healthcare professional if you notice:
- Gray, green or unusual orange discharge
- A strong or foul smell, itching or burning
- Sudden color changes with heavy bleeding or severe pain
- New bleeding between periods or after sex
- Large or frequent clots with heavy flow
- Dizziness, weakness, fever or shortness of breath during your period
- Gray tissue, or any bleeding when you may be pregnant, especially with pain
Your personal pattern matters most. What is normal for you is the best baseline, and any lasting change is worth mentioning to a doctor.
Menstrual Blood Color and Pregnancy
Color alone cannot confirm or rule out pregnancy. Light pink or brown spotting around the time of an expected period can sometimes be implantation bleeding, so test if pregnancy is possible. Our guide on why a period comes early covers how to tell implantation bleeding from a period.
After giving birth, bleeding called lochia usually starts bright red and slowly turns pink, then brown or yellowish over days to weeks.
Tips for Tracking Your Blood Color
- Note the color each day, along with flow, clots, pain and odor.
- Take the same notes for at least 3 cycles to see your own pattern.
- Record the first and last day of bleeding, so you know your period length.
- Mention any lasting change, or colors that worry you, at your next medical visit.
Using a period calculator to log your dates makes it easier to line up color changes with timing, and it also shows when your next period is likely to start.
Frequently Asked Questions
What does period blood color mean?
What does brown period blood mean?
What does black period blood mean?
Is bright red period blood normal?
What does pink period blood mean?
What does orange period blood mean?
What does gray period blood mean?
Are blood clots during a period normal?
When should I worry about the color of my period blood?
The Bottom Line
Period blood color naturally changes through your period. Pink, bright red, dark red, brown and black can all be normal depending on the day and your flow, and the main reason is simply how long the blood has been exposed to air.
What matters most is knowing your own pattern. Track color, flow and cycle length for a few months, and speak to a healthcare professional if a color feels very different from usual or comes with a bad smell, pain, itching or heavy bleeding. Most of the time, a change in color is just part of a normal period.
This article is for general education and is not a substitute for medical advice, diagnosis or treatment.
Sources & References
- Cleveland Clinic. What the Color of Your Period Blood Means. health.clevelandclinic.org
- Healthline. Period Blood: What Is Normal and What Is Not. healthline.com
- NHS. Heavy periods. nhs.uk
- Mayo Clinic. Menstrual cycle: What’s normal, what’s not. mayoclinic.org
- American College of Obstetricians and Gynecologists, Committee on Adolescent Health Care. Committee Opinion No. 651: Menstruation in Girls and Adolescents: Using the Menstrual Cycle as a Vital Sign. Obstetrics & Gynecology. 2015;126(6):e143-e146.
- Fraser IS, Critchley HOD, Broder M, Munro MG. The FIGO recommendations on terminologies and definitions for normal and abnormal uterine bleeding. Seminars in Reproductive Medicine. 2011;29(5):383-390.
- Munro MG, Critchley HOD, Fraser IS; FIGO Menstrual Disorders Committee. The two FIGO systems for normal and abnormal uterine bleeding symptoms and classification of causes of abnormal uterine bleeding in the reproductive years: 2018 revisions. International Journal of Gynecology & Obstetrics. 2018;143(3):393-408.
- Hallberg L, Högdahl AM, Nilsson L, Rybo G. Menstrual blood loss: a population study. Acta Obstetricia et Gynecologica Scandinavica. 1966;45(3):320-351.
- Itriyeva K. The normal menstrual cycle. Current Problems in Pediatric and Adolescent Health Care. 2022;52(5):101183.