Eosinophils are a type of white blood cell. They help fight infection and play a role in the body’s immune response. They can also build up and cause inflammation.

Normally, the blood does not contain a large number of eosinophils. The body can produce more of them in response to:

  • Allergic disorders
  • Skin conditions
  • Parasitic or fungal infections
  • Autoimmune diseases
  • Some types of cancer
  • Bone marrow disorders

In some conditions, eosinophils can leak out of the bloodstream into some organs and tissues. This can occur in different parts of the body, including the esophagus, heart, lungs, blood, and intestines. Treatment can vary, depending on the cause and the part of the body affected. Treatment often uses corticosteroids in part.

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