Extravasation: — When Chemotherapy Leaks From the Vein
Pain or swelling at the drip site during a chemotherapy infusion is not something to wait on. Some drugs cause serious tissue damage if they leak from the vein, and the sooner you report it, the less damage is done.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- Uncommon but serious — Most infusions complete without incident. When extravasation does happen, it can cause lasting tissue injury.
- Tell your nurse immediately — Reporting pain or swelling the moment it starts gives your team the best chance to limit harm.
- Some drugs are more dangerous than others — Vesicant drugs destroy tissue if they leak. Irritants cause pain but rarely lasting damage.
- Ports and PICC lines carry lower risk — Central access devices are less likely to cause extravasation than a peripheral cannula, but correct placement matters every time.
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Extravasation is when a chemotherapy drug leaks out of the vein into the tissue around the drip site. Some drugs destroy tissue if they leak. It is uncommon but serious. Pain, burning, or swelling at the needle site during or after your infusion is the key warning sign — tell your nurse immediately.
What do these words mean?
- Extravasation
- When a chemotherapy drug leaks out of the vein into the surrounding tissue. It needs immediate attention.
- Vesicant
- A drug that destroys tissue if it leaks. Examples include doxorubicin and vincristine. These carry the highest risk of lasting injury.
- Irritant
- A drug that causes pain and inflammation if it leaks, but rarely destroys tissue the way a vesicant does.
- Infiltration
- When a non-chemotherapy fluid leaks into tissue. Less dangerous than extravasation, but still needs reporting.
- Cannula
- The small plastic tube placed in your vein to deliver the infusion. The most common site where extravasation occurs.
What signs should I tell my nurse about immediately?
- Pain, burning, or stinging at or near the drip site
- Swelling or puffiness around the needle
- Redness or skin colour change near the cannula
- The drip slowing noticeably or stopping
- Fluid leaking around the needle entry point
- Tightness or hardness under the skin near the site
How serious can extravasation be?
It depends on which drug leaked. Vesicant drugs such as doxorubicin (also sold as Adriamycin) and vincristine can cause tissue death if the leak is not caught early. In severe cases this leads to wounds that need surgical treatment.
Irritant drugs cause pain and inflammation but rarely destroy tissue in the same way.
The factor that most affects the outcome is how quickly the leak is identified. Early reporting is not an overreaction — it is the correct response.
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What will my nurse do when I report pain at the drip site?
Your nurse will stop the infusion immediately. They will leave the cannula in place rather than removing it, because drawing back on the cannula can remove some of the leaked fluid from the tissue.
Depending on which drug leaked, they may apply cold or warm packs to the site. For certain vesicant drugs, a specific antidote may be given if the leak is caught quickly — your team follows a written protocol for each drug.
The site will be monitored in the days that follow. Watch for increasing redness, warmth, pain, swelling, or any discharge after you go home. A fever alongside any of these means contact your oncology team the same day — infection at a damaged site needs prompt treatment.
Other questions people ask about extravasation
Can extravasation happen through a port?
Yes, though it is less common than with a peripheral cannula. If the Huber needle placed into the port is not correctly seated in the port chamber, fluid can leak into the tissue beneath the skin. The signs are the same — pain, swelling, or the feeling that the infusion is not flowing normally. Tell your nurse immediately if anything feels different during a port infusion, including unusual pressure or tightness in your chest.
Can it happen with a PICC line?
PICC lines deliver chemotherapy into a large central vein, which makes extravasation less likely than with a peripheral cannula. It can still happen if the PICC tip has moved out of position. If you notice swelling, pain, or leaking along your arm during a PICC infusion, tell your nurse immediately rather than assuming it will pass on its own.
Is surgery always needed?
No. Many cases are managed without surgery when they are caught early and treated correctly. Surgery becomes more likely when a large volume of a vesicant drug has leaked and tissue death has already begun. This is why early reporting changes the outcome: a small, quickly identified leak is far easier to manage than one that has had time to spread through the surrounding tissue.
How do nurses try to prevent extravasation?
Before giving a vesicant drug, your nurse confirms the cannula is correctly placed by flushing it and checking that blood returns freely. The site is assessed at intervals during the infusion, and you will be asked to report any change in how it feels. If you have a history of fragile or difficult veins, your oncologist may recommend a port or PICC line rather than a new peripheral cannula for each cycle of treatment.
What infection signs should I watch for at the drip site after going home?
In the days after an infusion, check the site for increasing redness, warmth, pain, swelling, or any discharge. These can be signs of infection, and at a site where tissue damage has occurred they need prompt attention. If you develop a fever alongside any of these changes, contact your oncology team the same day rather than waiting for your next scheduled visit.
Did you know?
ESMO guidance on chemotherapy extravasation identifies prompt recognition and treatment as the most important factors in preventing long-term tissue damage — more so than the volume of drug that leaked.
The difference between a minor injury and a severe one is almost always how quickly the patient reported the first symptom.
Source: ESMO Clinical Practice Guidelines: Extravasation of Anticancer Agents
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- Chemotherapy Ports and Lines: Which Do You Need?
- Do You Really Need a Port?
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- Extravasation: When Chemotherapy Leaks From the Vein
- Looking After Your Port Between Cycles
- Looking After a PICC Line at Home
- Port Infection: Signs and What to Do
- Port Insertion: What the Procedure Involves
- Port vs PICC Line: Which Is Better?
- What Is a Chemotherapy Port?
- What Is a PICC Line?
- What to Report Immediately During an Infusion
- When and How Is a Port Removed?
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Frequently asked questions
Which chemotherapy drugs are most dangerous if they leak?
Vesicant drugs carry the highest risk. These include anthracyclines such as doxorubicin (Adriamycin), and vinca alkaloids such as vincristine and vinblastine, among others. Ask your treating team before treatment starts to confirm which drugs in your regimen are vesicants, so you know to pay close attention during those infusions. Irritant drugs cause pain and inflammation if they leak, but rarely destroy tissue in the same way.
How quickly does tissue damage appear after a leak?
With some vesicants, pain begins within minutes of the leak. With others — particularly anthracyclines — visible skin changes can develop over hours to days after the infusion and may appear to worsen even after treatment has begun. This is why you are asked to report any change at the site in the days following treatment, not only during the infusion. Delayed worsening is a known pattern, not a sign that the treatment has failed.
My arm hurts at the drip site but there is no swelling. Is that extravasation?
It may be, and the only safe approach is to tell your nurse immediately. Pain without visible swelling can be the first sign of a leak with some drugs. It can also be caused by the vein reacting to the drug, or by the position of the cannula. Your nurse will stop the infusion and assess the site. Do not try to decide for yourself — the assessment takes seconds and gives your team important information.
What if I notice swelling after the infusion has already finished?
Report it the same day. Do not assume that because the infusion is over, reporting is no longer useful. Your team can still assess the site and take steps to limit further damage. Use the contact number your team gave you for between-treatment concerns rather than waiting until your next scheduled appointment.
Can extravasation happen on a later cycle if earlier ones went without problems?
Yes. Veins become more fragile with each cycle of chemotherapy, and a cannula that was well placed on the first infusion may be harder to place reliably on the fifth or sixth. This is one of the reasons oncologists sometimes recommend a port or PICC line for regimens involving multiple cycles of vesicant drugs — central access reduces the risk of extravasation and also spares your peripheral veins from repeated punctures.
Will my nurse tell me if my drug is a vesicant?
Yes, and it is entirely reasonable to ask before the infusion starts. Ask which drugs you are receiving, which ones are vesicants, and what you should report if you feel anything change at the drip site. Knowing this in advance allows you to give early, accurate information if something does feel wrong. Your oncology team welcomes this kind of attention — it helps them respond more quickly.
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