Some conditions related to eosinophilia can be serious if not treated. Hypereosinophilic syndrome can cause organ damage. The cause is unknown, and doctors are still researching it.
Myeloproliferative neoplasms can damage bone marrow. Scientists believe neoplasms are probably the result of a mutation in an unknown gene.
When related to eosinophilia, this condition is called Myeloproliferative Hypereosinophilic Syndrome, or HES. To be diagnosed with HES, you must have persistent eosinophilia for six months or more, signs and symptoms of organ problems, and no other conditions that could cause eosinophilia.

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