About Sarcoidosis | American Lung Association

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About Sarcoidosis

Sarcoidosis is an inflammatory disease wherein the immune system goes into overdrive, causing cells to group together into clumps called granulomas. When too many granulomas form on an organ, they may interfere with the organ's function. Sarcoidosis can affect any organ in the body; however, lungs and lymph nodes are involved in more than 90 percent of patients. Although anyone can develop sarcoidosis, it is most common among people between the ages of 20 and 40, and more severe and more likely to be chronic in African Americans.

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