Medical Oncologist
Side effects
Unusual Bleeding or Bruising — On Cancer Drugs
Bruising and bleeding are known side effects of many targeted therapies. Most mild bruising can be watched at home. Some signs need emergency care today. Knowing the difference is the most important thing on this page.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026
- Not always dangerous — Small bruises from bumps are common when cancer drugs affect your platelets.
- Bleeding that will not stop is different — Bleeding that does not slow with firm pressure is a same-day emergency, not a wait-and-see situation.
- Blood in urine or stool is an emergency — This is never a normal part of treatment and always needs same-day assessment.
- Tell your team even about minor bruising — Patterns of bruising help your team spot platelet changes before they become serious.
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Unusual bruising and bleeding are recognised side effects of many targeted therapies and some chemotherapy drugs. They happen because these drugs affect how platelets work or how blood vessels repair themselves. Most mild bruising can be monitored at home. Any bleeding that will not stop, or blood in your urine or stool, needs same-day assessment — call your oncology team or go to the emergency department.
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 can you do at home for mild bruising?
Small bruises from bumps or injection sites are common when cancer drugs affect your platelets. They appear more easily than before and may take longer to fade.
For a fresh bruise, applying a cold pack wrapped in a cloth can help reduce swelling. Elevate the area if you are able to.
Do not take aspirin, ibuprofen, naproxen or other anti-inflammatory painkillers without checking with your team first. These affect how platelets work and can increase bleeding risk. Paracetamol is usually safer, but confirm with your team.
Avoid activities with a high risk of cuts or falls while you are on treatment. Tell your team about any new pattern of bruising at your next visit, even if it looks minor to you.
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Not sure whether this counts as an emergency?
Call the helpline. It is always better to check than to wait.
How do you tell manageable bruising from something that needs urgent review?
| Feature | Manageable at home | Needs same-day review — call your team |
|---|---|---|
| Bruise size and cause | Small, after a clear knock or injection | Large, or appearing without any obvious cause |
| Bleeding from a cut | Slows and stops with firm pressure | Continues or does not slow with pressure |
| Urine colour | Normal yellow | Pink, red or dark brown |
| Stool colour | Normal brown | Black and tarry, or red |
| Headache | Mild, familiar | Sudden and severe, unlike anything before |
| Spread of bruising | Stays in one area | Spreading, or many new bruises appearing together |
| Typically starts | Weeks into treatment as platelet levels are affected | Can appear at any point — new patterns always need prompt reporting |
When is it time to call your team rather than wait?
Call your oncology team the same day if you notice multiple bruises appearing without a clear cause, bruising that is spreading quickly, or bleeding from the gums or nose that is heavier than usual.
**If bleeding from any site does not slow down with firm, continuous pressure, go to the emergency department — do not wait for a callback from your team.**
Targeted therapies can lower platelet counts or change how well platelets function. Your team watches these counts in your regular blood tests, and a pattern of bruising may be the first visible sign of a change that needs action.
Your next scheduled appointment may be too far away if symptoms are developing now. When in doubt, call.
Did you know?
Several targeted therapies work by blocking a protein called VEGF, which cancer cells use to grow new blood vessels. This is part of how the drug slows the tumour — but the same mechanism means the body's normal blood vessel repair is also slower.
This is why bruising and minor bleeding are recognised effects of anti-angiogenic drugs in particular, and why your team tracks your platelet counts throughout treatment.
Source: ASCO Patient Information: Targeted Therapy and Anti-Angiogenic Agents
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Common questions
Frequently asked questions
Why am I bruising so easily on targeted therapy?
Many targeted therapies affect your platelets — the cells that help blood clot — either by reducing their number or by changing how well they work. Some drugs also affect the walls of small blood vessels directly. Both effects mean that minor bumps that would not normally leave a mark can now cause visible bruising. This is a known and expected side effect for several cancer drugs, not a sign that your cancer is worsening. Your team monitors your platelet count in your regular blood tests and will adjust your care if it reaches a level that needs attention.
Can I take paracetamol for pain if I am also bruising easily?
Paracetamol is generally considered safer than aspirin or ibuprofen when platelet counts are low, because it does not affect how platelets function the way anti-inflammatory drugs do. Confirm with your oncology team before taking anything regularly, because some treatments interact with paracetamol at higher doses or affect how the liver processes it. The drugs to avoid without asking first are aspirin, ibuprofen, diclofenac, naproxen and similar anti-inflammatory medicines — these can increase bleeding risk.
Does easy bruising mean my platelet count is dangerously low?
Not necessarily. Bruising can appear before counts reach a level your team would consider dangerous. The bruising is a visible clue, not a precise measure. Your blood test result is the actual number your team uses to decide whether treatment needs to be paused or adjusted. Mention any increase in bruising at your next visit — and if you also see any of the red-flag signs on this page, call the same day rather than waiting.
Should I stop my targeted therapy if I am bleeding or bruising?
Do not stop treatment without speaking to your oncologist first. Whether to pause or continue depends on how severe the bruising or bleeding is, what your platelet count shows, and how your treatment is working against the cancer. Those are decisions your team makes based on your full picture, not something to decide alone. If you are experiencing a red-flag symptom — blood in urine or stool, bleeding that will not stop, or a sudden severe headache — go to the emergency department now and your team will be involved from there.
I have been using a herbal remedy to help with the bruising. Do I need to tell my team?
Yes, please tell them. Several herbal products — including ginger, garlic supplements, high-dose turmeric, ginkgo biloba and fish oil — can affect how platelets work and may increase bleeding risk when combined with cancer drugs. This is not a judgement on the remedy itself. Your team needs to know everything you are taking so they can see the whole picture. Bring the product with you or write down the name and the amount you are taking.