Steroids cause decreased numbers of eosinophils to circulate, so that eosinophilia may be seen in Addison’s disease, for example.
Beta-blockers may cause eosinophilia by blocking beta-adrenergic eosinopenia. Atopic and nonatopic chronic asthma are frequently associated with mild eosinophilia. Numerous allergic diseases, allergic rhinitis, atopic dermatitis, and urticaria can also cause eosinophilia.
Parasites are the most common worldwide cause of eosinophilia, but other infections rarely cause it.