Interstitial (in-tur-STISH-ul) lung disease (ILD) describes a large group of disorders, most of which cause progressive scarring of lung tissue.

The scarring eventually affects your ability to breathe and get enough oxygen into your bloodstream.

They can be caused by exposure to harmful substances such as asbestos.

Also can be caused by other disease which effect the connective tissue, skin or joints such as rheumatoid arthritis, scleroderma.

In most cases the causes are unknown.

Once scarring sets in it is hard to reverse medications may help in certain cases.

Lung transplant is sometimes an option.

Sarcoidosis (sahr-koi-DO-sis) is characterized by the development and growth of tiny clumps of inflammatory cells in different areas of your body — most commonly the lungs, lymph nodes, eyes and skin.

The exact cause of sarcoidosis is unknown.

Usually it is self resolving but some patients do need treatment with medications which reduce inflammation.