# Period blood colour: what is normal?

> Bright red, dark brown, pink or watery: what the shades usually mean.

Category: Period care · 3 min read · Written by the Splash team · Sources checked October 2026
URL: https://splash.care/learn/period-care/period-blood-colour

## Quick answer

- Red, pink and brown are all normal during a period, and shades often change within one cycle.
- There is little formal research on colour, so smell, pain, amount and timing matter more.
- Grey, green or yellow blood or discharge with a smell, or bleeding with pain, is worth getting checked.

Your period blood is not always the same shade, even within one period. The good news is that a lot of variety is normal. The honest news is that there is not much formal research on colour, so doctors look at the whole picture: how heavy it is, how long it lasts, any smell, and how you feel.

## What the NHS says

The NHS says that when your period is at its heaviest the blood will be red, and that on lighter days it may be pink or brown. Cleveland Clinic adds that blood can range from pink to brown, and may even look rust-like.

## Common shades and what they usually mean

- **Bright or dark red:** the heaviest flow, when blood is leaving quickly.
- **Brown or very dark:** commonly explained as older blood that has had time to change colour. Common at the start or end of a period and on light days.
- **Pink:** often a light flow, at the start or end of a period or on lighter days (the NHS says blood on lighter days may be pink or brown).
- **Small jelly-like clots:** often normal on heavy days. Large ones are different (see the [clots](https://splash.care/learn/period-care/clots) guide).

## Changes worth getting checked

- **Grey-white, thin, watery discharge with a strong fishy smell:** the NHS links this pattern to [bacterial vaginosis (BV)](https://splash.care/learn/glossary/bv), which is common and treatable.
- **Green, yellow or frothy discharge:** the NHS says this may be trichomoniasis, an infection that needs treatment.
- **Any bleeding with pain in the pelvis, tummy pain, or a high temperature.**
- **A big change from your normal:** much heavier, much longer, or [bleeding between periods](https://splash.care/learn/cycle-basics/spotting-between-periods).

> **Splash says:** log your flow and colour for a few cycles. Your own "normal" is more useful than a chart from the internet.

**Myth:** Brown or black period blood means something is wrong.

**Fact:** Brown or very dark blood is usually older blood and is common at the start or end of a period. It is the other signs (smell, pain, heavy bleeding) that matter.

### When to see a doctor

The NHS says to get help from NHS 111 or a GP if your discharge changes colour, smell or texture, you feel itchy or sore, you bleed between periods, or you have pelvic pain. Do not self-diagnose. Ask for an urgent appointment, or call NHS 111, if your pelvic or period pain is severe or worse than usual and painkillers have not helped.

**Quick quiz:** Dark brown blood at the very end of your period is usually…

1. Older blood leaving slowly
2. A sign of a serious problem
3. Always an infection

Answer: Older blood leaving slowly. Brown blood is usually older blood. It is the combination with other signs, such as smell, pain or heavy bleeding, that deserves a check.

## Sources

1. [NHS: Periods](https://www.nhs.uk/conditions/periods/)
2. [Cleveland Clinic: Menarche (first period)](https://my.clevelandclinic.org/health/body/menarche)
3. [Cleveland Clinic: Menorrhagia (heavy menstrual bleeding)](https://my.clevelandclinic.org/health/diseases/17734-menorrhagia-heavy-menstrual-bleeding)
4. [NHS: Vaginal discharge](https://www.nhs.uk/symptoms/vaginal-discharge/)
5. [NHS: Bacterial vaginosis](https://www.nhs.uk/conditions/bacterial-vaginosis/)

This is general information, not medical advice. Splash can’t diagnose. If you’re worried, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 (UK) or 911 (US).