Familial or congenital (rare) Acquired Primary (clonal) Myeloproliferative neoplasms (MPN) Myelodysplastic syndrome (MDS) MDS/MPN overlap syndromes Acute myeloid leukemia (AML) Mastocytosis Myeloid/lymphoid neoplasms with eosinophilia (rearrangement of PDGFRA, PDGFRB, or FGFR1, or with PCM1-JAK2)Secondary (reactive) Secondary (reactive) Allergies Helminth infections Drug reactions Autoimmune disorders Cancer Lymphocyte variant hypereosinophilia syndrome (HES)
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