The short answer: brown blood is usually old blood that has taken a little longer to leave your body and has darkened on the way. It's very common at the start and end of a period, and as spotting just before one. Brown discharge is worth checking if it keeps happening between periods, after sex, after menopause, or comes with a bad smell, itching or pain.
Why blood turns brown
Fresh blood is bright red. When blood leaves the womb slowly, it has time to react with oxygen, which darkens it to brown, the same way a cut apple browns. That's why light, slow flow often looks brown, while heavy flow looks red.
Brown discharge at different points in your cycle
| When you see it | Most likely reason | Usually |
|---|---|---|
| A day or two before your period | Premenstrual spotting as the lining starts to shed | Normal |
| First day of your period | Slow start; older blood comes out first | Normal |
| Last days of your period | The final, slow flow | Normal |
| A few days after your period | Leftover blood clearing out | Normal |
| Mid-cycle | Ovulation spotting | Often normal if occasional |
| Around when your period is due, after unprotected sex | Possible implantation bleeding | Take a pregnancy test |
| After sex | Irritation of the cervix, or an infection | Check with a doctor if it repeats |
| On hormonal contraception | Breakthrough spotting, especially in the first months | Common; mention it if it carries on |
| After menopause | Not a period | Always see a doctor |
Other reasons for brown discharge
- Starting your periods or approaching menopause: cycles are less regular, and light brown spotting is common
- PCOS: periods can be infrequent and sometimes start with brown spotting
- Infection: brown or dark discharge with a strong or unpleasant smell, itching or burning
- Polyps or fibroids: growths in the womb or cervix that can cause spotting between periods
- A forgotten tampon: dark brown, smelly discharge; see a doctor promptly
Brown spotting or the start of a period?
Spotting is a few drops or a light smear, usually only noticed when you wipe or on a liner. A period builds into a flow that needs a pad or period panty, and turns red within a day or so. If brown spotting doesn't turn into a period and you might be pregnant, take a test.
See a doctor if
- You often have brown spotting between periods, for two or more cycles
- You bleed after sex
- You have any bleeding or spotting after menopause
- The discharge smells bad, or comes with itching, burning, fever or tummy pain
- You're pregnant and notice brown spotting
Staying comfortable
Brown spotting days don't need a full pad. A panty liner keeps underwear clean; change it every few hours. If spotting often turns into your period, a period panty covers both.
Frequently asked questions
Is brown period blood a sign of something wrong? Not usually. Brown at the start or end of a period is normal. What matters more is a change from your usual pattern.
Why is my whole period brown? A very light, slow period can look brown throughout. If your periods have become much lighter or shorter than usual, mention it to a doctor.
Is brown discharge a sign of pregnancy? It can be implantation bleeding, but it's more often just old blood. If your period is late, take a pregnancy test.
Related reading
- Normal Vaginal Discharge: What to Expect Through the Month
- Vaginal Itching Before Your Period: Causes and Relief
- Discharge Before Your Period or Early Pregnancy? How to Tell the Difference
This article is for general information and doesn't replace advice from your doctor.
Sources: NHS: Periods, NHS: Vaginal discharge