The natural history and prognosis of eosinophilia are highly variable and driven by the underlying disease process.

Natural history is highly variable and dependent on the disease process causing the eosinophilia.

Complications to monitor for are dictated by the underlying disease process. Since eosinophilia can accompany a wide variety of disease states, no single comprehensive list of complications can be given.

Again, no single prognosis can be given for eosinophilia. Eosinophilia may accompany allergies, which have an excellent prognosis, but it may also accompany a variety of malignancies with poor prognosis. Other causes of eosinophilia fall somewhere in the middle, such as Addison’s disease, which may be fatal if left untreated but has a good prognosis if recognized and treated.