Complications
By Mayo Clinic staff  In about two-thirds of people with sarcoidosis, the condition resolves  with no lasting consequences. But in some people, sarcoidosis can become  chronic and lead to complications that may affect different parts of  your body, such as your:  
- Lungs. Untreated pulmonary sarcoidosis can lead to  irreversible damage to the tissue between the air sacs in your lungs,  making it difficult to breathe.
- Eyes. Inflammation can affect almost any part of  your eye and can eventually cause blindness. Sarcoidosis can also cause  cataracts and glaucoma. However, this is rare.
- Kidneys. Sarcoidosis can affect how your body handles calcium and this can result in kidney failure.
- Heart. Granulomas within your heart can interfere  with the electrical signals that drive your heartbeat, which can cause  abnormal heart rhythms and even death. This occurs very rarely.
- Nervous system. A small percentage of people with  sarcoidosis develop problems related to the central nervous system when  granulomas form in the brain and spinal cord. Inflammation in the facial  nerves can cause facial paralysis.
- Reproductive system. In men, sarcoidosis can affect  the testes and possibly cause infertility. Women with sarcoidosis may  find it more difficult to conceive, and their signs and symptoms may  worsen after delivery.