When someone is told they have Essential Thrombocythaemia, or ET, the name alone can sound rather dramatic. I usually start by saying: take a breath. ET is a long-term blood condition, but for many people it behaves slowly, is monitored carefully, and can be managed very well.
ET means the bone marrow is making too many platelets. Platelets are the tiny blood cells that help stop bleeding when you cut yourself. They are useful little repair workers. In ET, there are simply more of them than usual, and sometimes they can make the blood more prone to clotting. Less commonly, if the platelet count is extremely high, bleeding can also become an issue because the platelets may not work normally.
Is ET a cancer?
ET belongs to a family of conditions called myeloproliferative neoplasms, or MPNs. That means a group of blood-forming cells in the marrow has developed a tendency to overproduce. I do use the word “neoplasm” honestly, but I also explain that ET is often very different from the fast-moving cancers people may imagine. Many patients live for years, and often decades, with regular monitoring and sensible treatment decisions.
How is ET usually found?
Quite often, ET is discovered by accident on a routine blood test showing a high platelet count. Some people have symptoms, such as headaches, dizziness, visual disturbance, burning or redness in the hands and feet, or unusual clotting or bleeding. Many people feel perfectly well.
Before calling it ET, we usually check for other causes of high platelets, such as iron deficiency, inflammation, infection, recent surgery, bleeding, or other medical conditions. We may also arrange mutation testing, commonly for JAK2, CALR, and MPL, and sometimes a bone marrow biopsy to confirm the diagnosis and exclude related conditions.
What are we trying to prevent?
The main issue in ET is not the platelet number by itself. The key question is: what is your personal risk of a blood clot or bleeding problem? We look at factors such as age, previous clots, cardiovascular risk factors, and mutation status. A platelet count of 700 does not mean the same thing in every person.
That is why two people with ET may have very different plans. One person may simply need monitoring. Another may need aspirin. Another may need treatment to lower the platelet count. The plan is personalised.
Treatment: not everyone needs tablets straight away
If ET is low risk and you feel well, careful observation may be enough. This does not mean we are ignoring it. It means we are watching thoughtfully rather than treating unnecessarily.
Some patients are advised to take low-dose aspirin, particularly when there are symptoms suggestive of platelet-related circulation issues or when clot risk is higher. Aspirin is not suitable for everyone, especially if there is a bleeding tendency or very high platelets with acquired von Willebrand problems.
For higher-risk ET, we may use platelet-lowering medication. Common options include hydroxycarbamide, interferon, and sometimes anagrelide. The choice depends on age, pregnancy considerations, other medical conditions, side effects, and your preferences.
What can you do?
You cannot “diet away” ET, but you can reduce the things that add to clot risk. This means not smoking, keeping blood pressure well controlled, managing cholesterol and diabetes, staying active, maintaining a healthy weight, and letting your doctors know before surgery, long flights, or pregnancy planning.
A good practical rule is: control the controllables. The marrow condition is our job to monitor and treat. The cardiovascular risk factors are a team effort.
When should you seek urgent help?
Please seek urgent medical attention if you develop symptoms suggestive of a clot or stroke: sudden weakness or numbness, facial droop, trouble speaking, chest pain, severe shortness of breath, a painful swollen leg, sudden visual loss, or a severe unusual headache. Also seek help for significant or unexplained bleeding.
Most aches, tingles, and odd symptoms are not emergencies, but I would much rather you ask early than worry quietly.
The usual follow-up rhythm
Living with ET is usually a marathon, not a sprint. We review blood counts, symptoms, medication tolerance, and any changes in your overall health. Sometimes we adjust treatment. Sometimes we simply keep watching.
My aim as your haematologist is not just to lower a number on a blood test. It is to keep you well, reduce avoidable risks, and make sure you understand what is happening without feeling frightened by the label.
Final thought
ET can sound intimidating, but it is often a very manageable condition. The best approach is calm monitoring, sensible risk reduction, and a treatment plan that fits you, not just your platelet count.