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After your biopsy

Biopsy Complications: — Rates and When to Act

Most biopsies cause nothing more than a day or two of soreness and bruising. A small number cause complications that need the same day — or the same hour. Knowing which is which is what this page is for.

Medically reviewed by Dr. Mohammed Imaduddin, Surgical Oncologist, MBBS · MS (General Surgery) · M.Ch (Surgical Oncology) · Last reviewed September 2026

  • Most complications are minor — Soreness, bruising and a little ooze at the site are expected and settle on their own.
  • Serious complications are uncommon — Significant bleeding, infection and pneumothorax after lung biopsy each affect a small minority of patients.
  • Timing differs by type — Bleeding usually happens within the first few hours. Infection typically appears two to five days later.
  • Some people are at higher risk — Blood thinners, low platelets and certain biopsy sites increase the chance of a complication.
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Serious biopsy complications are uncommon. Most people have a day or two of soreness and some bruising, which is expected. The signs that need a same-day call — heavy bleeding, new breathlessness, or fever — are less common but do happen. NCCN and ESMO guidance treats these as urgent, not wait-and-see.

If a symptom below applies to you, do not wait for a callback. Call 1800-202-8726 or go to your nearest emergency department.

What is expected after a biopsy — and what is not?

FeatureNormal — settle at homeNot normal — call or go to emergency
Bleeding at the siteLight ooze that slows with steady pressureSoaks through dressing, does not slow, or is bright red
BruisingBruise that spreads a little and fades over daysRapidly expanding bruise or swelling under the skin
PainMild to moderate soreness for one to three daysSevere, worsening, or spreading to a new area of the body
BreathlessnessNot expected after any biopsyAny new breathlessness after a lung or chest biopsy — go now
FeverFeeling run-down on the day of the procedureFever or chills, especially if it begins after the first 24 hours
Typically startsBleeding: within the first few hours. Bruising: same day.Infection: usually two to five days after the procedure.

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Who is at higher risk of a biopsy complication?

You are at higher risk if you are taking blood thinners, aspirin or anti-inflammatory medicines. Your team should have asked you to stop these before the biopsy — if they did not, or if you forgot to mention them, call now.

Low platelet counts, clotting disorders and the biopsy site all affect risk. A lung biopsy carries a higher chance of pneumothorax than a breast or lymph node biopsy. A liver biopsy carries a higher chance of internal bleeding, which is why teams watch you for longer afterwards.

None of these factors makes a complication likely — they shift the probability within a range that remains uncommon for most patients. Your team weighs them before deciding which technique to use.

What to watch for in the 48 hours after your biopsy

  • Keep the dressing dry and in place for as long as your team specified.
  • Apply firm, continuous pressure for at least 10 minutes if bleeding restarts. Do not keep lifting the dressing to check.
  • Take only the pain relief your team recommended. Avoid aspirin and ibuprofen unless your team has confirmed they are safe for you.
  • Check the site once a day for increasing redness, warmth, swelling or discharge — these are the early signs of infection.
  • After a lung biopsy, rest for the remainder of the day and avoid heavy lifting for 24 hours.
  • Tell your team about every medicine you are taking, including vitamins, herbal remedies and supplements — some affect bleeding risk.

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Common questions

Frequently asked questions

How common are serious biopsy complications?

Serious complications are uncommon. NCCN and ESMO guidance, alongside published procedural series, consistently describe significant bleeding as affecting a small minority of percutaneous biopsies — the figure is low for standard sites such as breast or lymph node. Pneumothorax after CT-guided lung biopsy is more frequent, though most cases are small and resolve without intervention. Infection is rare across all biopsy types. Your precise risk depends on the site, the technique, your platelet count and any medicines you are taking — ask your oncologist for a figure specific to your situation rather than relying on general population figures.

Can a biopsy spread cancer?

This concern — called needle tract seeding — is real but very rare. It is documented in case reports, but rates across large published series are very low. NCCN and ASCO regard biopsy as the standard way to diagnose cancer precisely because a reliable diagnosis outweighs this small risk. For certain cancers and sites your team will choose a technique designed to further reduce even this unlikely event. If the question is worrying you, ask your oncologist to explain the technique being used and why it was chosen for your specific situation.

What if I forgot to mention my blood thinners before the biopsy?

Call your oncology or radiology team now and tell them. Do not wait to see if a problem develops. Most blood thinners need to be stopped for a set number of days before a biopsy, and aspirin and anti-inflammatory medicines also affect clotting. If the biopsy has already been done, your team needs to know so they can decide how closely to watch you and for how long. This is also the reason the checklist item exists — the call is low-risk, and missing a complication because your team did not know is the higher risk.

Is a biopsy more dangerous if my platelet count is low from chemotherapy?

It can be, which is why your team checks your blood counts before proceeding. Chemotherapy can lower platelets, which slows clotting. If counts are too low on the day, the biopsy may be rescheduled rather than done at higher risk — this is a deliberate safety step, not a setback. If the biopsy has already been done and your platelet count was low, watch closely for bleeding and call the same day if it appears rather than waiting for your next scheduled appointment.

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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