Hematologist
CION Cancer Clinics
Treating a blood clot when you have cancer | CION Cancer Clinics
A blood clot in someone with cancer is treated with a blood thinner, usually daily injections or a tablet, and cancer treatment normally continues alongside it. Your haematologist and oncologist pick the medicine together, based on your cancer, platelet count, kidneys and other drugs. Breathlessness, chest pain or coughing up blood needs 108 or an emergency department now. This page explains the options, who they do not suit, and what to ask. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- How is a blood clot treated when you have cancer?
- Which blood thinners are used, and who do they not suit?
- What happens between the scan and the long-term plan?
- What do the words on your scan and blood report mean?
- What do families often get wrong about clots during cancer treatment?
- What can this page not tell you about your own clot?
- Common questions about clots in cancer patients
!
If you have these signs now, do not wait for your next oncology visit
Sudden breathlessness, chest pain that is worse when you breathe in, coughing up blood, a racing heartbeat or fainting can mean a clot has reached the lungs. Call 108 or go to the nearest emergency department straight away and say you are being treated for cancer. A newly swollen, painful, warm leg or arm also needs a same-day check.
The short answer
How is a blood clot treated when you have cancer?
A clot in someone with cancer is treated with a blood thinner, most often daily injections under the skin or a tablet, and the cancer treatment usually carries on alongside it. Your haematologist and oncologist choose the medicine together, because the right one depends on your cancer, your blood counts and the other drugs you take.
Why cancer makes clots more likely
Cancer cells release substances that make the blood thicken more easily. Surgery, time spent in bed, some chemotherapy and hormone medicines, and a central line (a thin tube placed in a large vein for treatment) all add to that. Doctors call this cancer-associated thrombosis, which simply means a clot linked to the cancer or its treatment.
Why it is not treated like any other clot
People with cancer are more likely to have a second clot, and also more likely to bleed on a blood thinner. Low platelets during chemotherapy, tumours in the stomach or bowel, and some brain tumours all change the balance. So the plan is less of a routine and more of a judgement made for you, and it is reviewed as your cancer treatment changes.
Never start, stop or change a blood thinner on your own. If something worries you, call the team that prescribed it.Not sure whether this applies to you?
Ask an oncologistThe options
Which blood thinners are used, and who do they not suit?
Each works well for the right person. Each has a group it does not suit, and that is usually what settles the choice.
Injections under the skin
Low-molecular-weight heparin, such as enoxaparin or dalteparin, is given once or twice a day into the tummy. You or a family member can learn to do it at home. It has few clashes with chemotherapy drugs.
May not suit
- People with poorly working kidneys
- Anyone who cannot manage daily injections
Tablets (DOACs)
Newer tablets such as apixaban, rivaroxaban and edoxaban need no injections and no routine blood test to set the dose. For many people with cancer they are now a common first choice.
May not suit
- Some stomach, bowel or bladder cancers, where bleeding risk is higher
- People on medicines that clash with them
- Anyone vomiting often and unable to keep tablets down
Warfarin
An older tablet that needs regular INR blood tests (a check of how thin the blood is). It is used less often in cancer because chemotherapy, antibiotics and changes in eating all make the level swing.
When a blood thinner cannot be given
If bleeding risk is very high, a small filter may be placed in the large vein from the legs to catch clots. It does not treat the clot itself and is usually a short-term step until a blood thinner is safe.
The pathway
What happens between the scan and the long-term plan?
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Confirming the clot
A leg or arm clot is usually confirmed with a Doppler ultrasound. A lung clot needs a CT scan of the chest. Sometimes a clot is spotted by chance on a routine cancer scan, and it is usually treated just the same.
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Starting treatment quickly
A blood thinner is usually started the same day. Before that, the team checks your platelets, kidney and liver tests, and asks about any recent bleeding.
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Checking it fits your cancer plan
Your oncologist and haematologist look at your chemotherapy, targeted or hormone medicines for clashes. Upcoming surgery, a biopsy or a line change is planned around the blood thinner.
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Adjusting through chemotherapy
If your platelets fall, the team may lower or pause the blood thinner for a while. This is a medical decision made on your latest blood test.
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Deciding how long to continue
Treatment usually runs for several months, and often for as long as the cancer is active or being treated. It is reviewed at regular visits.
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On your report
What do the words on your scan and blood report mean?
- DVT
- Deep vein thrombosis. A clot in a deep vein, usually in the leg, sometimes in the arm near a central line.
- PE
- Pulmonary embolism. A clot that has travelled to the lungs. It needs urgent treatment.
- VTE
- Venous thromboembolism. The umbrella term that covers both DVT and PE.
- D-dimer
- A blood test for clot breakdown. It is often raised in cancer anyway, so a high result alone does not prove a clot.
- Anticoagulant
- The medical name for a blood thinner. It stops clots growing while your body clears the existing one.
Commonly believed
What do families often get wrong about clots during cancer treatment?
"A clot means the cancer has spread."
A clot is a problem with the blood, not a sign on its own that the cancer has moved. It can happen at any stage, including early cancer and after surgery. What your scans show about the cancer is a separate question for your oncologist.
"Chemotherapy will have to stop now."
Most people carry on with cancer treatment once the blood thinner is in place. A cycle may occasionally be moved, but stopping cancer treatment because of a clot is uncommon.
"Once the leg looks normal, the injections can stop."
The swelling settles long before the risk does. Stopping early is one of the commonest reasons a clot comes back. Only the team that started the medicine should decide when it ends.
"Massaging the leg or hot oil will break the clot."
Rubbing a leg with a clot does not dissolve it and may be unsafe. Keep the leg raised when resting, walk as advised, and let the medicine do its work.
Being straight with you
What can this page not tell you about your own clot?
This page cannot tell you which blood thinner is right for you, or for how long. That depends on the type and site of the cancer, the treatment you are on, your kidney function, your platelet count and your own bleeding history. Two people with the same cancer can end up on different medicines for good reasons.
Bleeding signs to report the same day
Black or bloody stools, blood in the urine, vomiting blood, a nosebleed that will not stop, a bad headache after a fall, or bruises appearing without a knock. Call your team or go to emergency. Do not simply skip the next dose on your own.
How CION helps
At CION, a clot during cancer treatment is reviewed by the haematology team, led by Dr. Basudev Pokhrel, together with your oncologist, and complex cases are discussed at the tumour board. Scans and specialised tests may be arranged with qualified partner centres.
Tell every doctor, dentist and pharmacist that you are on a blood thinner before any procedure or new prescription.Questions we are asked
Common questions about clots in cancer patients
Can a blood clot in a cancer patient be treated at home?
Often, yes. Many people with a leg clot start injections or tablets and go home once the team is sure they are stable. A lung clot with breathlessness, low oxygen or a high bleeding risk usually needs a hospital stay first. Your doctor decides this after seeing your scan and blood tests.
Are injections better than tablets for a cancer clot?
Neither is better for everyone. Tablets are easier and work well for many people. Injections may be preferred with some stomach and bowel cancers, when vomiting is frequent, or when a chemotherapy drug clashes with tablets. The choice is made for your situation, and it can be switched later if things change.
My father's platelets are low from chemotherapy. Can he still take a blood thinner?
Sometimes, with changes. The team looks at how low the platelets are, how recent the clot is, and whether there has been any bleeding. They may reduce the medicine or pause it for a short time. Do not change the dose at home. Ask the team what count they are watching for.
Can a clot come back even on a blood thinner?
It can, and it is more common in cancer than in other people. If new swelling, pain or breathlessness appears while on treatment, tell your team the same day. They will check whether doses were missed, whether a medicine is clashing, and whether a different blood thinner would suit you better.
Will the clot affect surgery or a biopsy I am waiting for?
It may change the timing. A recent clot makes stopping a blood thinner riskier, so non-urgent procedures are sometimes moved. When a procedure goes ahead, the team gives exact written instructions on when to hold and restart the medicine. Follow those rather than general advice from anywhere else.
Can my PICC line or port cause a clot?
Yes. A central line can lead to a clot in the arm or neck veins. Watch for swelling of one arm, the hand or face, or prominent veins on the chest. The line often stays in place and the clot is treated with a blood thinner, but your team decides that.
Should everyone with cancer take a blood thinner to prevent clots?
No. For most people the bleeding risk outweighs the benefit. Prevention may be offered after major cancer surgery, during a hospital stay, or for some people judged at high risk because of their cancer type and treatment. Ask your oncologist whether you fall into one of those groups.
Is this treatment covered by Aarogyasri or insurance?
Clot treatment during cancer care is often covered as part of an approved cancer treatment plan. Aarogyasri, CGHS, ECHS, EHS, PM-JAY and cashless insurance each have their own rules, and those rules change. Check your current cover with the scheme or insurer, and bring your card details to your visit.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Deep vein thrombosis (DVT)
- NICE — Venous thromboembolic diseases: diagnosis, management and thrombophilia testing (NG158)
- American Society of Hematology — Blood Clots
- NHLBI — Venous Thromboembolism
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Clotting, Thrombosis and AnticoagulationThe full guide to clots and blood thinnersPulmonary Embolism: Recognising ItThe lung clot signs that need 108Bleeding Risk on AnticoagulantsWhich bleeding signs to report and whenHow Long to Stay on Blood ThinnersWhat decides when treatment can endBlood counts during chemotherapyWhy low platelets change the plan
Talk to us
Diagnosed with a clot during cancer treatment?
Share your scan report, blood results and medicine list. Our haematology team will review them with your oncologist and explain the next step.