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• Summary
• Start Here
• Diagnosis and Tests

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• Living With
• Specifics
• Genetics

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Research

• Clinical Trials
• Journal Articles

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• Children
• Patient Handouts

Summary

Eosinophils are a type of white blood cell. They help fight off infections and play a role in your body's immune response. They can also build up and cause inflammation.

Normally your blood doesn't have a large number of eosinophils. Your body may produce more of them in response to:

• Allergic disorders
• Skin conditions
• Parasitic and fungal infections
• Autoimmune diseases
• Some cancers
• Bone marrow disorders

In some conditions, the eosinophils can move outside the bloodstream and build up in organs and tissues. This can happen in many different parts of the body, including the esophagus, heart, lungs, blood, and intestines. Treatment of eosinophilic disorders can vary, depending on the cause and which part of the body is affected. Steroids are often part of the treatment.

Start Here

• Eosinophilia (Mayo Foundation for Medical Education and Research) Also in Spanish
• Eosinophilic Disorders (Merck & Co., Inc.) Also in Spanish

Diagnosis and Tests

• Upper GI Endoscopy (National Institute of Diabetes and Digestive and Kidney Diseases) Also in Spanish

Living With

• Feeding Tubes (American Partnership for Eosinophilic Disorders)

Specifics

• Churg-Strauss Syndrome (Mayo Foundation for Medical Education and Research)
• Eosinophilic Fasciitis (Merck & Co., Inc.)
• Eosinophilic Granulomatosis with Polyangiitis, formerly Churg-Strauss Syndrome (EGPA) (Johns Hopkins Vasculitis Center)
• Eosinophilic Lung Diseases and Disorders (National Jewish Health)
• Hypereosinophilic Syndrome (HES) (American Partnership for Eosinophilic Disorders)

Genetics

• Eosinophil peroxidase deficiency: MedlinePlus Genetics (National Library of Medicine)
• PDGFRA-associated chronic eosinophilic leukemia: MedlinePlus Genetics (National Library of Medicine)
• PDGFRB-associated chronic eosinophilic leukemia: MedlinePlus Genetics (National Library of Medicine)

Clinical Trials

• ClinicalTrials.gov: Churg-Strauss Syndrome (National Institutes of Health)
• ClinicalTrials.gov: Eosinophilia (National Institutes of Health)
• ClinicalTrials.gov: Hypereosinophilic Syndrome (National Institutes of Health)

Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

• Article: Predictors of duodenal eosinophil counts among subjects undergoing diagnostic endoscopy.
• Article: Estrogen signaling suppresses tumor-associated tissue eosinophilia to promote breast tumor growth.
• Article: Concurrent Eosinophilia Increases the Prevalence of Nail Abnormalities and Severity of...
• Eosinophilic Disorders -- see more articles

Reference Desk

• Eosinophilic Disorders Glossary (American Partnership for Eosinophilic Disorders)

Find an Expert

• National Institute of Diabetes and Digestive and Kidney Diseases

Children

• About Eosinophilic Disorders (Children's Hospital of Philadelphia)

Patient Handouts

• Eosinophil count - absolute (Medical Encyclopedia) Also in Spanish
• Eosinophilic fasciitis (Medical Encyclopedia) Also in Spanish
• Simple pulmonary eosinophilia (Medical Encyclopedia) Also in Spanish