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Essential thrombocythaemia (ET) belongs to a group of conditions called myeloproliferative neoplasms (MPNs), which also includes polycythaemia vera and myelofibrosis. ET is a chronic condition that is characterised by too many platelets (blood cells that helps the blood clot) in the blood. This booklet explains what ET is, what causes it, who it affects, how it affects your body, what symptoms to expect and likely treatments.