The short answer: Yes, a little is expected. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says light bleeding from the anus is normal after a polyp removal or biopsy. Bleeding that is heavy, keeps coming back, or starts days later is different. Delayed bleeding can appear up to 2 weeks after the procedure, and it needs a call to your doctor or urgent care.
How much blood is normal after a polyp is removed?
Removing a polyp leaves a small raw spot on the colon wall. A streak of blood on the toilet paper or a little blood mixed with the first bowel movement fits what NIDDK calls light bleeding. The American Society for Gastrointestinal Endoscopy (ASGE) describes it the same way: bleeding after a biopsy or polyp removal is usually minor and normally stops on its own.
No source we reviewed gives a safe amount in teaspoons or tablespoons. The official pages describe a pattern instead. Light bleeding that fades is expected. Bleeding that continues or grows is not. The MedlinePlus colonoscopy discharge instructions tell patients to contact their provider for blood in the stool for more than 2 bowel movements, and for black, tarry stools.
If you are not sure what was removed, your report lists each polyp by size and location. Our guide to colon polyps explains those terms.
What is delayed bleeding, and how many days later can it start?
Doctors split bleeding into two kinds. Immediate bleeding happens during the colonoscopy, and NIDDK notes the doctor can treat it right away. Delayed bleeding starts after you go home, sometimes after several days with no blood at all.
NIDDK states that delayed bleeding can occur up to 2 weeks after the procedure. Research uses a similar window. A randomized trial of 4,270 people published in Annals of Internal Medicine in 2023 counted delayed bleeding within 14 days of polyp removal. An older case series in Gastrointestinal Endoscopy described nine patients whose bleeding began between 12 hours and 12 days after the polyp was removed.
So a clean first few days does not close the window. Keep watching the toilet bowl for about two weeks.
How common is bleeding after polyp removal?
It is uncommon. NIDDK cites a study of screening colonoscopies in which bleeding occurred in about 15 out of every 10,000 procedures. That figure covers all colonoscopies, including those with no polyp removed. NIDDK adds that most cases occur in older people or in people who had polyps removed.
Among people who did have a polyp removed, the rate is higher. A 2017 meta-analysis of 12 studies and 14,313 patients found a pooled delayed bleeding rate of 1.5%. The studies disagreed with each other a great deal, and the confidence interval ran from 0.7% to 3.4%. Treat 1.5% as a rough middle value.
The removal method also matters. In the 2023 trial above, all polyps were 4 to 10 mm. Delayed bleeding followed 0.4% of removals done with a cold snare (a wire loop with no electric current) and 1.5% of those done with a hot snare. Severe delayed bleeding was rarer: 0.05% and 0.4%.
What raises the risk of delayed bleeding?
The 2017 meta-analysis found four factors tied to delayed bleeding:
- Polyp size over 10 mm (odds ratio 3.41)
- A polyp in the right side of the colon (odds ratio 1.60)
- Cardiovascular disease (odds ratio 1.55)
- High blood pressure (odds ratio 1.53). Our sibling site hypertension.md covers blood pressure in plain language.
Age, sex, smoking, alcohol use, and diabetes were not significant risk factors in that analysis.
Medicines that affect clotting are the other group. A 2015 meta-analysis in Alimentary Pharmacology and Therapeutics found a higher risk of delayed bleeding in people taking clopidogrel (odds ratio 9.7). A 2017 meta-analysis of five studies found a higher bleeding risk in people given heparin as a bridge while their usual blood thinner was paused (odds ratio 8.29).
The evidence on aspirin and NSAIDs such as ibuprofen is mixed. A 2018 meta-analysis of 11 studies found no rise in immediate bleeding but a higher chance of delayed bleeding (odds ratio 1.7). The 2015 analysis found a similar number, but the result lost significance when one small study was removed. Its authors concluded that aspirin or NSAID use does not increase the risk.
What do guidelines say about blood thinners, aspirin, and NSAIDs afterward?
Less than most patients expect. The 2022 guideline from the American College of Gastroenterology and the Canadian Association of Gastroenterology looked for evidence on when to restart anticoagulants (warfarin or direct oral anticoagulants) and P2Y12 inhibitors such as clopidogrel. The panel could not recommend same-day restart over restart 1 to 7 days later. The evidence was insufficient.
For people who take aspirin to prevent a second heart attack or stroke, the same guideline suggests against stopping it for a planned endoscopy at all.
This means there is no single correct restart day. Your plan depends on why you take the medicine, the size of the polyp, and how it was removed. MedlinePlus tells patients to ask their doctor when to restart medicines or blood thinners. Do not stop, restart, or add a blood thinner, aspirin, or an NSAID on your own. Our post on medications held before a colonoscopy covers the decisions made before the procedure.
When should you call the doctor or go to the emergency room?
MedlinePlus lists these reasons to contact your provider after a colonoscopy:
- Red blood in your stool, or blood in your stool for more than 2 bowel movements
- Black, tarry stools
- Severe pain or cramps in your belly
- Chills or a fever over 101°F (38.3°C)
- Vomiting that will not stop, or vomiting blood
- Chest pain
NIDDK names a shorter list that needs medical care right away: severe abdominal pain, fever, bloody bowel movements that do not improve, bleeding from the anus that does not stop, dizziness, and weakness.
Dizziness and weakness matter because they can mean you have lost enough blood to affect your circulation. Bleeding with either one, bleeding that does not stop, or severe belly pain is a reason for emergency care, not a message left for the office. Severe pain or fever can also point to a problem other than bleeding. Mild gas cramps that ease within hours are a separate and common issue.
When you call, say that you had a polyp removed and give the date. Mention every blood thinner, aspirin product, or NSAID you take.
How is delayed bleeding treated, and what should you avoid in the first days?
Many cases stop without a procedure. A 2025 expert consensus statement on delayed post-polypectomy bleeding notes that many cases resolve on their own, and that a share of repeat colonoscopies done for this problem end with no treatment needed.
When treatment is needed, NIDDK says the doctor may diagnose and treat the bleeding with a second colonoscopy. ASGE lists the tools: medicine injected at the site, heat treatment (cauterization), or small metal clips placed on the blood vessel. The 2025 consensus adds radiology or surgical procedures for the most severe cases.
The official guidance on what to avoid is short. MedlinePlus says that if a polyp was removed, your doctor may ask you to avoid lifting and other activities for up to 1 week. Follow the written discharge sheet from your own endoscopy unit, because it reflects what was done to you.
The bottom line
A little blood in the first bowel movements after a polyp removal is normal, and it should fade. Bleeding can also start late, up to 2 weeks after the procedure. Published rates of delayed bleeding sit near 1.5% of patients who had polyps removed, with higher risk for polyps over 10 mm, right-sided polyps, and some blood-thinning medicines. Call your doctor for blood in more than 2 bowel movements or black stools. Get care right away for bleeding that does not stop, dizziness, weakness, fever, or severe belly pain. Your pathology result then sets the date of your next colonoscopy.
Last updated: October 2026. This article is for informational purposes only and does not constitute medical advice. Contact your endoscopy team or seek emergency care if you have heavy or ongoing bleeding, dizziness, fever, or severe pain after a polyp removal.