Sarcoidosis is a disease in which inflammation occurs in the lymph nodes, lungs, liver, eyes, skin, and/or other tissues.
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The exact cause of sarcoidosis is unknown. What is known is that when a person has the disease, tiny clumps of abnormal tissue (granulomas) form in certain organs of the body. Granulomas are clusters of immune cells.
The disease can affect almost any organ. It most commonly affects the lungs.
Doctors think that having certain genes makes it more likely for a person to develop sarcoidosis. Things that may trigger the disease include infections with bacteria or viruses. Contact with dust or chemicals may also be triggers.
The disease is more common in African Americans and white people of Scandinavian heritage. More women than men have the disease.
The disease often begins between ages 20 and 40. Sarcoidosis is rare in young children.
A person with a close blood relative who has sarcoidosis is nearly 5 times as likely to develop the condition.
There may be no symptoms. When symptoms do occur, they can involve almost any body part or organ system.
Almost all people affected by sarcoidosis have lung or chest symptoms:
Sarcoidosis symptoms will often get better without treatment.
If the eyes, heart, nervous system, or lungs are affected, corticosteroids are usually prescribed. This medicine may need to be taken for 1 to 2 years.
Medicines that suppress the immune system are sometimes also needed.
In rare cases, people with very severe heart or lung damage (end-stage disease) may need an organ transplant.
With sarcoidosis that affects the heart, an implantable cardioverter-defibrillator (ICD) may be needed to treat heart rhythm problems.
Many people with sarcoidosis are not seriously ill, and get better without treatment. Up to half of all people with the disease get better in 3 years without treatment. People whose lungs are affected may develop lung damage.
Overall death rate from sarcoidosis is less than 5%. Causes of death include:
Bleeding from the lung tissue
Heart damage, leading to heart failure and abnormal heart rhythms
Denis Hadjiliadis, MD, MHS, Paul F. Harron, Jr. Associate Professor of Medicine, Pulmonary, Allergy, and Critical Care, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.