What are the most usual causes of eosinophilia in America?
In developed nations such as the United States the most common causes of eosinophilia are allergic conditions and parasitic infections. For instance, someone with asthma might experience a rise in eosinophils during an attack or during allergy season. Sometimes eosinophilia is connected with certain types of cancers. And, sometimes, no cause can be ascertained. Eosinophilia can be transient or it may be life-threatening, if the count rises high enough. In addition, anecdotal evidence points to the possibility that a few persons may always run higher than normal eosinophil counts – but the count might be normal for those persons. Of course, the higher counts would not be dangerously high!
