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Sarcoidosis (“sar-koy-do-sis”) is a disease that causes swelling in the cells in different organs of your body. It usually affects your lungs. It can also affect other organs, like your skin, eyes, lymph nodes and brain.
With sarcoidosis, some of your blood cells bunch together to form tiny lumps called granulomas. The granulomas can form in different parts of your body. If they build up in your lungs they can stop them from working properly.
Doctors don’t know for sure what causes sarcoidosis. They think that sarcoidosis may be caused by a combination of genetics and environmental factors.
The symptoms are different in different people. Your symptoms depend on how long you have had sarcoidosis, and where the granulomas are, and how many there are.
Doctors diagnose sarcoidosis by listening to you explain your symptoms, examining you, doing tests and ruling out other disease that cause similar symptoms.