Visual Encyclopedia

Disease

A disease is a particular abnormal condition that affects part or all of an organism and that consists of a disorder of a structure or function. The study of disease is called pathology, which includes the study of cause. Disease is often construed as a medical condition associated with specific symptoms and signs. It may be caused by external factors such as pathogens or by internal dysfunctions, particularly of the immune system, such as an immunodeficiency, or by a hypersensitivity, including allergies and autoimmunity.

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A little boy, friends with the group Pearl Jam, talks of his skin condition and his feelings toward it. It is a very touching video, this boy has to live with very fragile organs and skin day by day.

Contributed by Colleen Koval

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