Sarcoidosis is an inflammatory disease that affects multiple organs in the body, but mostly the lungs and lymph glands. In people with sarcoidosis, abnormal masses or nodules (called granulomas) consisting of inflamed tissues form in certain organs. These granulomas may alter the structure and function of the affected organ(s). The symptoms of sarcoidosis can vary greatly, depending on which organs are involved. Most patients initially complain of a persistent dry cough, fatigue, and shortness of breath. The exact cause of sarcoidosis is not known. The disease is associated with an abnormal immune response, but what triggers this response is uncertain. There is no cure for sarcoidosis, but the disease may get better on its own over time. Follow the links below to find WebMD's comprehensive coverage about how sarcoidosis is contracted, what it looks like, how to treat it, and much more.