The short answer: Bright red, dark red, brown, pink and even black can all be normal period colours. The shade mostly tells you how fresh the blood is and how quickly it is flowing: fast flow looks bright red, slow flow turns darker. Grey is the one colour that isn't a normal period colour and needs a check-up. Orange or any colour with a bad smell, itching, fever or pain also needs a doctor.
Why period blood changes colour
Period blood isn't only blood. It's a mix of blood, tissue from the womb lining (the endometrium), mucus and vaginal fluid. How it looks depends on that mix and on how long it took to leave your body.
When blood flows quickly, it comes out bright red. When it moves slowly, it has time to react with oxygen and darken, the same way a cut apple turns brown. This is called oxidation. That's why your period often starts or ends darker than it looks on day two.
So a change in colour from one day to the next is expected. It's not a sign of "dirty blood" or "heat" in the body, as some people say. Your body isn't getting rid of toxins through period blood. It is simply shedding the lining of the womb.
Period blood colour chart
Use this as a quick guide. The last column matters most: colour on its own is rarely a worry, but colour plus other symptoms can be.
| Colour | What it usually means | When it's normal | When to see a doctor |
|---|---|---|---|
| Bright red | Fresh blood flowing quickly | Your heaviest days, often days 1 to 3 | If it carries on well past 7 days, or appears between periods or after sex |
| Dark red or maroon | Blood that pooled a little longer in the womb | Mornings, or after lying down for a while | Rarely a concern on its own |
| Brown | Older blood that has darkened | First and last days, or a little spotting just before a period | Brown spotting between periods that keeps happening |
| Black | Very old, slow-moving blood | The start or end of a period | With a strong smell, fever, itching or pain, or if something may have been left inside |
| Pink | Blood diluted with vaginal fluid | Very light days, or light spotting around ovulation | Pink spotting often, or a very light period for months in a row |
| Orange | Blood mixed with discharge | Occasionally, with no other symptoms | With itching, a fishy smell or unusual discharge |
| Grey or grey-white | Not a period colour | Never | Always, as it can point to an infection, or in pregnancy a miscarriage |
Bright red: your flow is in full swing
Bright red is the colour most people expect. It shows blood is leaving the womb quickly, so you usually see it on your heaviest days, often the first two or three.
It isn't a concern on its own. It's worth a check if bright red bleeding goes on well past seven days, if you are soaking a pad every one to two hours, or if it appears between periods or after sex. Bleeding between periods or after sex isn't a period, even if it looks like one, and the NHS advises getting it checked.
Dark red and maroon: blood that waited
Dark red blood is often what you see first thing in the morning, or when you stand up after sitting through a long lecture or meeting. Blood collected in the womb or vagina while you were still, and had time to darken.
Dark red blood can be thicker and may come with small clots. Small clots on heavy days are common. Clots bigger than about 2.5 cm, around the size of a ₹10 coin, are a sign of heavy flow and worth discussing with your doctor. Our guide to blood clots in your period explains the coin test in more detail.
Brown and black: older blood at the start or end
Brown
Brown is one of the most common colours people search about, and it's usually completely normal. At the start of a period, flow is slow, so the first blood has had time to darken. At the end, the last of the lining clears out slowly.
A day or two of brown spotting just before your period starts is also common. It becomes worth discussing with a doctor when it happens in the middle of your cycle month after month, or after sex.
For a closer look at brown spotting at other times, including in early pregnancy, read Brown Discharge and Brown Period Blood: What It Means.
Black: alarming to see, usually harmless
Black or very dark brown blood is simply blood that has taken even longer to leave the body. It can look like coffee grounds. It's most often seen on the first or last day of a period, and on its own it isn't a concern.
The exception is black or dark discharge with a strong, unpleasant smell, fever, itching or pain. That can mean an infection, or something that was left inside the vagina, such as a forgotten tampon or a piece of cotton. Tampons left in too long can rarely lead to a serious illness called toxic shock syndrome. If this might be you, see a doctor promptly. Don't try to remove something you can't easily reach.
Pink: a light flow
Pink usually means a small amount of blood has mixed with vaginal fluid or cervical mucus. You may see it on the first day, on the last day, or when your period is very light.
Some people also notice light pink spotting for a day or so around the middle of their cycle, when they ovulate. Cleveland Clinic notes it is usually light and lasts a day or two.
A period that is pink, watery and very light for several months in a row is worth mentioning to your doctor. Big weight changes, very intense exercise, hormonal contraception, thyroid problems and PCOS can all make periods lighter. Read Why Is My Period Suddenly Lighter? for the common reasons.
Orange and grey: check for an infection
Orange
Orange-tinged blood usually comes from blood mixing with discharge. On its own, with no other symptoms, it's not usually a worry.
If it comes with itching, burning when you pee, a fishy or unpleasant smell, or discharge that looks different from usual, it may be an infection. Get it checked rather than self-treating with creams from the chemist, because different infections need different treatment.
Grey
Grey isn't a normal period colour. Thin, watery, grey-white discharge with a fishy smell, often stronger after sex, is a common sign of bacterial vaginosis (BV). BV is an imbalance in the usual bacteria in the vagina. It isn't caused by poor hygiene and is easily treated with antibiotics from a doctor.
If you are pregnant and notice grey tissue or discharge with bleeding, contact your doctor or go to hospital straight away, as this can be a sign of miscarriage.
For more on infection signs, see Vaginal Infections: Signs, Causes and How to Prevent Them.
Colour is only one clue: what else to notice
Doctors find colour less useful than the overall pattern of your periods. These tell them much more:
- How heavy it is: changing a pad every one to two hours, doubling up, or bleeding through to clothes or bedding.
- How long it lasts: a usual period lasts two to seven days, often around five.
- How often it comes: anywhere from 21 to 35 days between the first day of one period and the next is common.
- Clots: larger than about 2.5 cm, or lots of them every period.
- Timing: bleeding between periods, after sex, or after menopause.
- Smell: period blood has a mild metallic smell. A strong, fishy or rotten smell is not usual.
A quick way to keep track
For two or three cycles, jot down in your phone's notes or a period app: the date, the colour on each day, how many products you used, and anything unusual. If you're a teen, a parent or older sister can help. This takes a minute a day and makes a doctor's visit much quicker and more useful.
See a doctor if
- You see grey discharge or tissue
- Any colour comes with a strong or unpleasant smell, itching, burning, fever or pelvic pain
- You bleed between periods, after sex, or after menopause
- Your periods are heavy, last more than seven days or come with large clots
- Your periods have become very light for several months and you aren't sure why
- You think something, such as a tampon, may have been left inside
Get urgent help if
Call 112 or 108, or go to the nearest hospital emergency department, if you are or might be pregnant and have bleeding with severe tummy pain, shoulder pain, dizziness or fainting, or if you have heavy bleeding with feeling faint or a racing heart. Also get urgent help if you have a high fever, a sunburn-like rash, vomiting or feel suddenly very unwell while using a tampon.
How colour shows up on your period products
On a pad or period panty, blood often looks darker than it does on toilet paper, because the absorbent layers concentrate the colour. A brown or black patch on a period panty is usually just older blood, not a sign of anything wrong.
- Rinse in cold water first. Hot water sets blood stains. With reusable period panties, rinse in cold water until it runs clear, then wash gently with a mild detergent and air-dry in the sun. In the monsoon, a fan-dried corner indoors works well. Our guide on how to wash period panties has the full steps.
- Use a liner for spotting days. For pink or brown spotting before or after your period, a panty liner is usually enough.
- Keep it gentle. A mild intimate wash on the outside only, or plain water, is plenty. Never wash inside the vagina or douche, as it can upset the vagina's balance and make infections like BV more likely.
Frequently asked questions
Why is my period brown on the first day? Because the flow is still slow, the first blood has had more time to darken before leaving your body. It usually turns red within a day as your flow picks up.
Is black period blood dangerous? Usually not. It's old blood that took a long time to leave the womb. See a doctor if it comes with a bad smell, fever, itching or pain.
Why is my period blood watery and pink? It usually means a light flow mixed with vaginal fluid. If your periods stay very light and pink for several months, mention it to your doctor.
Does dark period blood mean my blood is impure? No. Dark blood is simply older blood that has met oxygen. Period blood is not "impure" or "dirty", and colour doesn't show toxins.
Does period blood colour show if I'm healthy? It gives a few clues but isn't a test. How long your period lasts, how heavy it is and how regular your cycle is tell your doctor much more.
Can pink or brown spotting mean I'm pregnant? Light spotting around the time your period is due can occasionally be implantation bleeding. If you've had unprotected sex, take a home pregnancy test.
Is it normal for colour to change during one period? Yes. Many people go from brown or pink, to bright red, to dark red, then back to brown over a single period.
Related reading
- Heavy Periods: How Much Bleeding Is Too Much?
- Bleeding Again After Your Period Ended? What It Means, by Timing
- Normal Vaginal Discharge: What to Expect Through the Month
- Yellow Discharge After Your Period: Normal or a Sign of Infection?
This article is for general information and doesn't replace advice from your doctor.
Sources: NHS: Periods, NHS: Heavy periods, NHS: Bacterial vaginosis, Cleveland Clinic: Period Blood Color: What It Means, Cleveland Clinic: Spotting During Ovulation