Elevated eosinophil levels can be an indicator of inflammation or allergic reactions in other parts of the body. When the eosinophil count is 1500/µL or higher, it is classified as hypereosinophilic syndrome (HES) or an eosinophilic disorder. Depending on the specific body part affected, these eosinophilic disorders can include:

* Eosinophilic fasciitis (Shulman syndrome)
* Eosinophilic cystitis affecting the bladder
* Eosinophilic gastrointestinal disorders
* Eosinophilic pneumonia (a disease affecting the lungs)