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Definition. Eosinophilia (e-o-sin-o-FIL-e-uh) is a higher than normal level of eosinophils. Eosinophils are a type of disease-fighting white blood cell. You can have high levels of eosinophils in your blood (blood eosinophilia). High levels of eosinophils may also occur in your body's tissues at the site of an infection or inflammation (tissue eosinophilia).
Eosinophil: A normal type of white blood cell that has coarse granules within its cytoplasm. Eosinophils are produced in the bone marrow and migrate to tissues throughout the body. When a foreign substance enters the body, other types of white blood cells (lymphcytes and neutrophils) release substances to attract eosinophils and then release toxic substances to kill the invader. The numbers of eosinophils in blood often rise when an allergic reaction occurs.