What Is Eosinophilia in Children
Eosinophilia in children refers to an elevated number of eosinophils in the blood or tissues. Eosinophils are white blood cells involved in immune responses, especially against parasites and in allergic reactions. Mild eosinophilia is common and often transient, while persistent or high levels may signal an underlying condition that needs evaluation.
Common Causes and Symptoms
Typical causes include allergic diseases such as asthma, eczema, and food allergies, as well as infections, particularly parasitic ones. Drug reactions, autoimmune conditions, and certain rare disorders can also raise eosinophil counts. Symptoms depend on the cause and may include rash, itching, cough, abdominal pain, diarrhea, or fatigue.
Diagnosis and When to Seek Care
Diagnosis usually begins with a complete blood count and differential to confirm eosinophilia. Additional tests may include allergy panels, stool studies for parasites, imaging, or specialized blood tests depending on suspected causes. Parents should consult a pediatrician if a child has persistent symptoms, recurrent infections, or unexplained organ involvement. For more details on eosinophilic disorders, see the American Academy of Allergy, Asthma & Immunology overview at aaaai.org/conditions-and-treatments/eosinophilic-disorders.
