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Essential thrombocythaemia, explained for patients and families | CION Cancer Clinics
Essential thrombocythaemia, or ET, is a slow-growing blood cancer in which the bone marrow makes too many platelets. The main risk is a blood clot, and sometimes bleeding when counts are very high. Most people live with ET for many years with check-ups and, when needed, aspirin or tablets. Many have no symptoms, and it is often found on a routine blood test. 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
- What is essential thrombocythaemia?
- What symptoms does ET cause?
- How is essential thrombocythaemia diagnosed?
- What do the words on your ET reports mean?
- Is it ET, or are platelets high for another reason?
- What do families believe about ET, and what is actually true?
- What does ET mean for the years ahead, and what can this page not tell you?
- Common questions about essential thrombocythaemia
The short answer
What is essential thrombocythaemia?
Essential thrombocythaemia, or ET, is a long-term condition in which the bone marrow makes too many platelets. It is a slow-growing blood cancer, and most people live with it for many years with regular check-ups and, when needed, treatment to lower the risk of clots.
What platelets do, and why too many is a problem
Platelets are tiny cells that clump together to seal a cut. When there are far too many, and they are overactive, clots can form where they should not: in the legs, the lungs, the heart or the brain. Oddly, a very high count can also cause bleeding, because the platelets use up a clotting protein.
Why it is called a blood cancer
ET belongs to a group called myeloproliferative neoplasms, or MPNs. The word neoplasm means a growth that starts from a change in one cell. In ET a gene change in a marrow cell tells it to keep making platelets. Families hear the word cancer and fear the worst. ET behaves very differently from acute leukaemia, and for most people the focus is on preventing clots rather than on intensive treatment.
ET is not passed on to children in the usual way, and it is not caused by anything you ate or did.How it shows itself
What symptoms does ET cause?
Many people have no symptoms at all. ET is often found by chance on a blood test done for something else.
Small blood vessel symptoms
Headaches, dizziness, brief blurring or flickering of vision, and tingling in the fingers. These come from tiny clots slowing the blood flow.
Burning hands and feet
Red, warm, burning fingers or toes, often worse with heat. This is called erythromelalgia and often eases with aspirin.
Clots
Sometimes the first sign is a clot: a swollen, painful leg, sudden chest pain, or signs of a stroke or heart attack.
Needs 108 straight away
- Face drooping or weak arm
- Slurred speech
- Chest pain or sudden breathlessness
Bleeding and tiredness
Easy bruising, nosebleeds or bleeding gums, mostly with very high counts. Some people also feel tired, itchy or notice a slightly enlarged spleen.
Not sure whether this applies to you?
Ask an oncologistGetting a diagnosis
How is essential thrombocythaemia diagnosed?
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A high platelet count that stays high
The usual starting point is a platelet count above 450 x 10⁹/L that is still raised on repeat tests. One high result on its own is not a diagnosis. Reference ranges differ slightly between laboratories.
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Looking for another cause
Infection, low iron, inflammation, recent surgery or a removed spleen can all push platelets up. The doctor rules these out first.
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Gene testing on a blood sample
A JAK2, CALR or MPL gene change is found in most people with ET. A positive result strongly supports the diagnosis. Some people have none of the three, and are still diagnosed with ET after other tests.
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A bone marrow test
A small sample of marrow, usually from the back of the hip, shows how the marrow looks. It separates ET from related conditions that are managed differently.
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Working out your clot risk
Your age, any past clot and your gene result place you in a risk group. That group decides whether you need aspirin, tablets to lower the count, or simply monitoring.
On your report
What do the words on your ET reports mean?
- Thrombocytosis
- A high platelet count from any cause. It is a description, not a diagnosis of ET.
- JAK2 V617F
- The most common gene change in ET. Detected means it was found in your blood cells. It is acquired, not inherited.
- CALR and MPL
- Two other gene changes that can drive ET. The one you have affects your clot risk and sometimes the treatment choice.
- Triple negative
- None of the three common gene changes was found. ET can still be the diagnosis, but other causes are checked more carefully.
- Megakaryocytes
- The large marrow cells that make platelets. A bone marrow report describes how many there are and how they look.
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Side by side
Is it ET, or are platelets high for another reason?
Points towards ET
Points towards another cause
Count stays high on repeat tests over months
Count falls once an infection or inflammation settles
A JAK2, CALR or MPL gene change is found
No gene change and a clear trigger is present
Iron levels are normal
Low iron, and platelets fall when it is corrected
Burning hands or feet, or an unexplained clot
Symptoms match an illness such as arthritis or a bowel condition
Commonly believed
What do families believe about ET, and what is actually true?
"It is a blood cancer, so she needs chemotherapy now."
Many people with lower-risk ET need only aspirin and check-ups, or check-ups alone. When treatment to lower the count is needed, it is usually a daily tablet or injection, not hospital chemotherapy.
"High platelets mean thick blood, so drinking more water will fix it."
Staying well hydrated is sensible, especially when travelling or unwell. It does not change how many platelets the marrow makes, and it does not replace the treatment your haematologist recommends.
"He feels fine, so the follow-up visits are a waste."
ET usually feels like nothing until a clot or a change in the counts happens. Regular blood tests are how problems are caught while they are still easy to act on.
"Women with ET cannot have children."
Many women with ET have healthy pregnancies. The pregnancy needs planning with a haematologist and obstetrician, and some medicines are changed before conception.
Being straight with you
What does ET mean for the years ahead, and what can this page not tell you?
For most people, ET is a condition to live with rather than an emergency. The outlook depends on your age, whether you have had a clot, your gene result, your other health conditions and how well clot risks such as smoking, blood pressure and diabetes are controlled.
What can change over time
In a small number of people, ET slowly changes over many years into myelofibrosis, where the marrow becomes scarred, or less often into acute leukaemia. This is why counts and symptoms are followed for life. New tiredness, sweats, weight loss or a swollen belly are worth reporting.
What this page cannot tell you
It cannot tell you whether your high platelets are ET, which risk group you belong to, or which treatment suits you. Those answers come from your repeat blood tests, gene result and marrow report, read together by a haematologist. Bring every report you have to the first appointment, including older blood counts that show how the numbers have moved.
CION's haematology team reviews each new case and discusses it at a tumour board before a plan is confirmed.Questions we are asked
Common questions about essential thrombocythaemia
Is essential thrombocythaemia a serious illness?
It is a long-term blood cancer that needs lifelong follow-up, but for most people it is slow and manageable. The main danger is a clot, which treatment aims to prevent. How serious it is for you depends on your age, clot history and gene result, which your haematologist will explain.
Will ET shorten my life?
Many people with ET live close to a normal lifespan, especially when clots are prevented. Your own outlook depends on your risk factors and how the condition behaves over time. A figure from the internet cannot tell you about your case. Ask your haematologist to explain your own picture.
Is ET hereditary? Should my children be tested?
The gene changes in ET are acquired during life in the marrow cells, not passed down in the usual way. A few families do have more than one member with an MPN. Routine testing of children is not usually needed, but tell your haematologist if relatives have had similar blood problems.
My platelets were high once. Do I have ET?
Not necessarily. A single high count is often caused by an infection, low iron, inflammation or recent surgery. The test is usually repeated after a few weeks. If the count stays high with no clear cause, a haematologist will look further with gene tests and possibly a marrow test.
What treatment is used for ET?
It depends on your risk group. Options include low-dose aspirin, hydroxyurea tablets, interferon injections and anagrelide, which all aim to lower clot risk or the platelet count. Some lower-risk people need only monitoring. Your haematologist chooses based on your age, history and plans such as pregnancy.
Can ET go away on its own?
No. ET is a lasting condition, though the counts can be well controlled with treatment. If platelets drop back to normal without treatment, the diagnosis is usually looked at again, because a temporary cause may have been responsible. Treatment controls ET while you take it.
Is ET the same as polycythaemia vera?
They are related MPNs and can share the JAK2 gene change. In ET the platelets are the main problem. In polycythaemia vera the red cells, and so the haemoglobin and haematocrit, are raised. Some people first diagnosed with ET are later found to have polycythaemia vera once low iron is corrected.
Is ET treatment covered by Aarogyasri or insurance?
Cover for tests, marrow studies and long-term medicines varies. Aarogyasri, CGHS, ECHS, EHS, PM-JAY and cashless insurance each have their own rules, and these change. Call the helpline with your card or policy details and we will check what your current cover includes.
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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
- NHLBI — Thrombocythemia and Thrombocytosis
- NHS — Essential thrombocythaemia
- 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.
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