What is sarcoidosis?

Sarcoidosis is an immune system disorder that can attack any organ of the body. However, it most frequently starts in the lungs and lymph nodes, particularly those in the chest cavity. Sarcoidosis is characterized by the presence of small (microscopic) areas or lumps of inflamed cells called granulomas. The granulomas can grow and form larger clusters within an organ and may affect the function of that organ. Granulomas can be found inside the body, for example, on the walls of the bronchi and bronchioles (breathing tubes) in the lungs. They can also appear as sores on the skin. […]