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Aspirin in an MPN: why it is given and who it does not suit | CION Cancer Clinics
Low-dose aspirin is given to lower the chance of a blood clot. In polycythaemia vera it is offered to almost everyone who can safely take it. In essential thrombocythaemia it depends on your gene result, your age, any past clot and your platelet count, because a very high count can make aspirin cause bleeding. Aspirin does not bring the counts down or treat the MPN itself. At CION Cancer Clinics, every leukaemia, MDS and MPN case is reviewed by our haematologist and discussed at a tumour board before a plan is agreed.
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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
- Why is aspirin given in polycythaemia vera and essential thrombocythaemia?
- Will aspirin be recommended for you?
- What does aspirin do, and what does it not do?
- Who should not take aspirin, or needs extra care?
- What should you do before surgery or dental work?
- What do people get wrong about aspirin in an MPN?
- Which signs should you mention to your team?
- Common questions about aspirin in an MPN
The short answer
Why is aspirin given in polycythaemia vera and essential thrombocythaemia?
Low-dose aspirin is given to lower the chance of a blood clot. In polycythaemia vera it is offered to almost everyone who can safely take it. In essential thrombocythaemia it depends on your risk group, your gene result and your platelet count.
Why clots are the main worry in an MPN
In a myeloproliferative neoplasm, or MPN, the bone marrow makes too many blood cells. Thicker blood and overactive platelets make clots more likely in the legs, lungs, heart, brain and sometimes the veins of the belly. Preventing those clots is the first aim of treatment, often before anything else.
What aspirin actually does
Platelets are the small cells that stick together to seal a cut. Aspirin makes them less sticky. It does not lower the platelet count, thin the blood in the way people imagine, or treat the MPN itself. It works alongside venesection or tablets that bring the counts down, not in place of them. Think of it as one layer of protection among several, including not smoking and keeping blood pressure, sugar and cholesterol in check.
The strength and timing are set by your haematologist. Do not start, stop or change aspirin on your own, including before a procedure.Who is offered it
Will aspirin be recommended for you?
The answer depends on which MPN you have and what else your tests show. These are the usual patterns, not rules for your own case.
Polycythaemia vera
Low-dose aspirin is part of standard care for most people, together with keeping the haematocrit under control. Studies in this group showed fewer clots without a large rise in serious bleeding.
ET with a JAK2 change
A JAK2 gene change carries a higher clot risk, so aspirin is usually offered, even when you are younger and have never had a clot.
ET with a CALR change and low risk
Here the balance is less clear. Some studies suggest aspirin adds more bleeding than protection for younger people with no clot history, so your haematologist may simply watch.
What tips the decision
- High blood pressure or diabetes
- Smoking or high cholesterol
- Symptoms such as burning feet
After a clot
If you have already had a clot, you may need a stronger blood thinner instead of, or as well as, aspirin. That choice needs careful thought about bleeding.
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What does aspirin do, and what does it not do?
What aspirin does
What it does not do
Makes platelets less sticky, lowering clot risk
Does not bring the platelet or red cell count down
Often eases burning, red hands and feet
Does not stop the MPN from progressing
Can help headaches and visual flickers from small clots
Does not replace venesection or count-lowering tablets
Works for as long as you keep taking it
Does not give protection that lasts after stopping
Being careful
Who should not take aspirin, or needs extra care?
Aspirin is not right for everyone with an MPN. The main risk is bleeding, and some people have a higher chance of it than others.
A very high platelet count
This sounds backwards, but it matters. When platelets are extremely high, they can use up a clotting protein called von Willebrand factor. Your blood then clots less well, and aspirin can tip that into real bleeding. Your haematologist may test for this before starting aspirin, and may bring the count down first.
Stomach and bleeding problems
A past stomach ulcer, bleeding from the gut, a known bleeding disorder or an aspirin allergy all change the decision. People who already take a blood thinner usually should not add aspirin without specialist advice. A stomach-protecting medicine is sometimes added.
Children and pregnancy
Aspirin is generally avoided in children and teenagers. In pregnancy it is sometimes used on purpose, but only under a plan made by your haematologist and obstetrician together. If you are planning a pregnancy, tell your haematologist before you conceive, so the plan is ready in time rather than made in a hurry.
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Before a procedure
What should you do before surgery or dental work?
Tell the doctor or dentist early
Say that you have an MPN and take aspirin, at the first visit, not on the day. Bring your latest blood count.
Let the two teams talk
The surgeon weighs bleeding. Your haematologist weighs clotting. The plan for aspirin should come from both of them together.
Follow the written plan
For many minor procedures aspirin is continued. For some operations it is paused. Only change it if you are told to, in writing.
Restart as instructed
Ask exactly when to start again. Clot risk rises after surgery, so restarting on time matters as much as pausing.
Commonly believed
What do people get wrong about aspirin in an MPN?
"It is only a small aspirin, so it does not matter if I skip it."
The protection only lasts while you keep taking it. Missing days often, without telling anyone, leaves you with the clot risk the aspirin was meant to reduce.
"Aspirin thins the blood, so I do not need venesection."
Aspirin does not lower the haematocrit. In polycythaemia vera, keeping the red cell level down is a separate and equally important part of treatment. You need both.
"My bruises mean the aspirin is too strong, so I will cut it."
Easy bruising can come from aspirin, from a very high platelet count or from other medicines. The cause needs a blood test. Tell the team rather than adjusting it yourself.
"A painkiller from the chemist is the same as my aspirin."
It is not. Some common painkillers, such as ibuprofen, can interfere with how aspirin works and add to stomach bleeding. Ask a pharmacist which pain relief is safe for you.
Report these
Which signs should you mention to your team?
- Black, tarry stools or vomit that looks like coffee grounds: go to emergency the same day
- Nosebleeds or bleeding gums that are new or hard to stop
- Many bruises you cannot explain
- Stomach pain or indigestion that keeps coming back
- Wheezing, a rash or swelling of the face after a dose
- Any plan by another doctor to add a blood thinner or painkiller
Questions we are asked
Common questions about aspirin in an MPN
How long will I need to take aspirin?
For most people with polycythaemia vera, and for those with essential thrombocythaemia who are advised to take it, aspirin is long term. The clot risk from an MPN does not go away. Your haematologist reviews at each visit whether it is still the right choice, especially if your counts, age or other illnesses change.
Can I buy low-dose aspirin at any pharmacy?
Low-dose aspirin is widely available, but that does not mean it is safe to start on your own. With a very high platelet count it can cause bleeding. Take it only after your haematologist has looked at your counts and advised it, and keep to the strength they chose.
My platelets are high but I was told not to take aspirin. Why?
Some people with essential thrombocythaemia have a low clot risk, often with a CALR gene change and no other risk factors. For them, aspirin may add more bleeding than protection. Others have a platelet count so high that aspirin is unsafe until the count is lower. Ask which applies to you.
Does aspirin help the burning in my hands and feet?
Often, yes. Burning, red and warm hands or feet in an MPN are usually caused by overactive platelets blocking tiny blood vessels. Aspirin frequently eases this quite quickly. If the burning does not settle, or your fingers or toes turn dark or cold, see a doctor the same day.
Is aspirin the same as a blood thinner like warfarin?
No. Aspirin acts on platelets. Warfarin and the newer blood thinners act on the clotting proteins in the blood. They are used for different reasons, and taking both together raises bleeding risk considerably. That combination should only happen when a haematologist has decided it is needed.
Should I take it with food?
Many people are advised to take aspirin with or after food to reduce stomach upset. Follow the instructions on your own prescription. If you get indigestion, heartburn or stomach pain, tell your doctor. A stomach-protecting medicine may be added rather than the aspirin being stopped.
What if I have a heavy nosebleed at home?
Sit forward and pinch the soft part of your nose firmly for a good ten to fifteen minutes without letting go. If the bleeding does not stop, is very heavy, or comes with dizziness, go to the nearest emergency department or call 108, and tell them you have an MPN and take aspirin.
Can the family give me aspirin if I have chest pain?
If you have chest pain, call 108 first. Do not wait to decide about tablets at home. Tell the emergency team that you have an MPN and what you already take, including your daily aspirin, so they can decide what extra treatment is safe for you.
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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 — Low-dose aspirin
- NHS — Polycythaemia
- Leukemia & Lymphoma Society — Essential thrombocythemia
- Blood Cancer UK — Myeloproliferative neoplasms
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
Thrombosis Risk in MPN and How It Is ScoredHow your risk group decides whether aspirin is advisedBurning Hands and Feet in MPNThe symptom aspirin often easesSurgery and Travel With an MPNPlanning around procedures while on aspirinPolycythaemia Vera and Essential ThrombocythaemiaThe full guide to both conditions
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Not sure whether aspirin is right for you?
Share your blood reports and gene test result. CION's haematology team will explain what they mean for your clot risk. One helpline serves every CION centre.