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After your colonoscopy

Blood in Stool — After a Colonoscopy Biopsy

A colonoscopy biopsy is a moment of uncertainty — a small tissue sample taken to answer a question, with results that take days to come back. In the meantime, blood in your stool can feel alarming. For most people, a small amount is an expected part of healing.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • Some blood is normal — A streak of blood in your stool for the first day or two is an expected part of healing.
  • Heavy bleeding is not — Clots, worsening bleeding, or blood that clearly increases is a reason to call your care team today.
  • Dark tarry stool needs checking — Very dark, sticky stool can indicate bleeding higher in the gut and is worth reporting the same day.
  • Know when to escalate — Faintness, dizziness, or severe pain alongside bleeding means going to emergency, not waiting.
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A small amount of blood in your stool in the first day or two after a colonoscopy biopsy is expected and normal. The biopsy site can bleed a little as it heals. Heavy or worsening bleeding, large clots, or bleeding that continues beyond a few days needs same-day contact with your care team.

What the terms on your discharge sheet mean

Biopsy
A small piece of tissue taken from the gut lining using tiny forceps passed through the colonoscope. The site is usually a few millimetres across.
Biopsy site
The small wound left in the gut lining once the tissue is removed. It heals over several days in the same way a skin graze does, and it can bleed a little during that time.
Post-procedural bleeding
Bleeding that happens as the biopsy site heals in the days after the procedure. A small amount is expected. Heavy, worsening, or prolonged bleeding is not.
Haemostasis
The process by which bleeding stops, either on its own or with a clip or injection placed during the procedure. Your discharge notes will say whether any haemostasis measure was used.

Is some blood in your stool normal after a biopsy?

Yes. A small amount of blood or pink-tinged stool in the first day or two is an expected part of healing. The biopsy removes a tiny piece of tissue, leaving a small wound in the gut lining that can bleed a little.

Most people notice a streak on the day of the procedure or the morning after. This usually settles without any treatment.

What is normal is small — a tinge or streak, not a large amount that fills the bowl or soaks through to the paper.

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How much bleeding is too much?

Any bleeding that is clearly getting worse rather than better is a reason to call your care team today — not your next scheduled appointment.

Passing a large clot, or seeing stool that is very dark red or maroon rather than a simple streak, is a sign to act on the same day.

Bleeding that continues for more than a few days, even if it seems small, is also worth reporting. The biopsy site should be healing by then, not still bleeding.

When should you seek care?

Call your care team the same day if bleeding is worsening, if you are passing clots, if the blood is heavy rather than a trace, or if it has not settled within a few days.

Go to the emergency department if you feel faint or dizzy alongside the bleeding, if you have severe abdominal pain, or if you are vomiting blood.

Do not wait for a scheduled appointment if you are worried. Same-day contact is the safe default whenever you are unsure.

What to do if you notice more bleeding than expected

  1. Note what you are seeing

    Is it a streak or a larger amount? Are there clots? Is it getting worse or staying the same? This is exactly what your care team will ask when you call.

  2. Check your discharge sheet

    Your post-procedure notes may already specify what to expect and when to call. Read them before searching online — they are written for your specific procedure.

  3. Call your care team the same day

    If the bleeding is worsening, if there are clots, or if it has not settled within a few days, call the number on your discharge sheet. Do not wait for a scheduled appointment.

  4. Go to emergency if you feel unwell

    If you feel faint, dizzy, or have severe abdominal pain alongside the bleeding, go to the nearest emergency department rather than waiting for a callback.

  5. Tell your team what you saw

    Note the colour and roughly how much. This helps them decide whether you need to come in or whether what you describe is within what was expected for your procedure.

Explore 133 more Biopsy by Body Part topics

HUB — Biopsy by Body Part

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Common questions

Frequently asked questions

How long is some bleeding normal after a colonoscopy biopsy?

A small amount of bleeding is expected for one to two days after the biopsy. Most people notice a streak in the stool on the day of the procedure or the day after, and it settles without treatment. Bleeding that continues beyond a few days, or that is clearly worsening at any point, is a reason to call your care team rather than wait for your next appointment.

Is dark or black stool after a colonoscopy serious?

Stool can appear darker than usual after a colonoscopy because of the bowel prep, and this usually settles within a day. Truly black, tarry, sticky stool with a distinctive smell is different — it can indicate bleeding from higher in the gut rather than the biopsy site itself. If your stool is that kind of dark rather than simply discoloured, call your care team the same day.

Can I take painkillers after a colonoscopy biopsy?

Anti-inflammatory pain medicines — the kind often used for joint pain, headaches, or fever — can increase the risk of bleeding at the biopsy site and are best avoided for a few days unless your care team has told you to continue them for another reason. For mild discomfort, ask your care team which option is safe for you. Your discharge notes may already address this, and if you are on regular medicines of any kind, check before stopping or changing them.

I also had a polyp removed — does that change the bleeding risk?

Yes. Polyp removal involves taking away more tissue than a simple biopsy, and the risk of bleeding is slightly higher. Your care team should have told you specifically what to watch for if a polyp was removed. If you are unsure what was done during your procedure, the answer is in your procedure report or discharge sheet, and your care team can clarify over the phone.

When will I get my biopsy results?

Results usually take one to two weeks from the procedure date, though this can vary depending on the laboratory and the type of tissue being examined. Your team will contact you or ask you to come in for a follow-up appointment. If you have not heard within the timeframe you were given, it is fine to call and ask. A delay in contacting you does not mean the result is abnormal.

Is there anything I should avoid while the biopsy site heals?

For the first few days, avoid heavy physical exertion, alcohol, and anti-inflammatory medicines unless your care team has said they are fine to continue. These can increase the risk of bleeding at the biopsy site. You can eat and drink normally unless your discharge notes say otherwise. If sedation was used during your procedure, your treating team will advise when you can drive and return to usual activity — follow that guidance directly rather than a general rule.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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