Rare diseases · Sign or symptom

Myeloproliferative disorder

HP:0005547

What it means

Proliferation (excess production) of hemopoietically active tissue or of tissue which has embryonic hemopoietic potential.

There are four main myeloproliferative disroders, 1) chronic myelogenous leukemia (CML); 2) Polycythemia vera; 3) Essential thrombocytosis; and 4) Myelofibrosis.

Rare diseases that can present with this9

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Myeloproliferative disorder

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This page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.