<unk>  is a rare congenital disorder characterized by the presence of sustained elevations in blood eosinophil levels that reach ranges diagnostic of<unk>  (i.e. 500-1500/microliter) or, far more commonly, hypereosinophilia (i.e. >1,500/microliter). Although high eosinophil levels are associated with certain diseases and thought to contribute to the tissue destruction found in many other<unk> -related diseases (see clonal<unk> , clinical manifestations and tissue destruction related to the<unk>  in<unk>  is uncommon: this genetic disease typically has a benign phenotype and course compared to other congenital and acquired<unk>  diseases.
Familial eosinophilia
Tropical eosinophilia
Hypereosinophilic syndrome
Hereditary angioedema
Lymphocyte-variant hypereosinophilia
Mast cell activation syndrome
Drug reaction with eosinophilia and systemic symptoms
Mixed connective tissue disease