It is a disease that is more common in young adults. Many people with sarcoidosis are between the ages of 20 and 40. Destruction of the bronchioles and narrowing and damaging of small blood vessels may follow. A specific diagnosis of histiocytosis X can be made by using a test called bronchoalveolar lavage, which involves removing and identifying cells from the lower respiratory tract. Corticosteroid therapy may be prescribed, but there is no clear evidence that this treatment is effective.
X are current or former cigarette smokers.
However, the association with smoking is not well understood. Many jobs, particularly those that involve mining or that expose workers to asbestos or metal dusts can cause pulmonary fibrosis. Agricultural workers can also be affected. Some organic substances, such as moldy hay, cause an allergic reaction in the lung. This reaction is called Farmer's Lung and can cause pulmonary fibrosis.