(StatePoint) April is Sarcoidosis Awareness Month and to help bring light to this rare disease, the American Lung Association sat down with Rhonda Jenkins, program manager at the Respiratory Institute within Cleveland Clinic to discuss connecting patients with resources and the community with understanding. What is sarcoidosis? Sarcoidosis is an inflammatory disease in which the immune system overreacts, causing clusters of inflamed tissue called âgranulomasâ to form in different organs. It most commonly affects the lungs and lymph nodes, but can also affect the eyes, skin, heart and nervous system. Sarcoidosis is a rare lung disease, with fewer than 200,000 estimated cases in the U.S. Symptoms vary from person to person, and with good treatment and follow-up, may improve.