What Causes Pulmonary Fibrosis? -- An Overview
Pulmonary fibrosis is the medical term for scarring and thickening that occurs deep within the lung tissue. It is thought that this damage occurs as a result of repeated injury to the lung tissue, which leads to inflammation and an excess build-up of a protein known as collagen.
However, there is not just one cause for the type of lung damage seen with pulmonary fibrosis. In fact, there are many conditions that either can cause pulmonary fibrosis or are associated with it. These diseases are collectively known as interstitial lung diseases.
In some of these diseases, such as asbestosis, the cause of pulmonary fibrosis is known. In other cases, it is not known why pulmonary fibrosis develops. This is the case with pulmonary fibrosis as a result of
scleroderma.
Known Causes of Pulmonary Fibrosis
There are a number of pulmonary fibrosis causes that are known. The largest of these include long-term exposure to occupational and/or environmental inhalants, such as organic or inorganic dusts, and a variety of irritative or toxic gases. Some examples include long-term inhalation of:
- Asbestos fibers (asbestosis)
- Silica dust (silicosis)
- Other metal dust in mines or factories
- Fumes found on farms, such as from moldy hay (farmer's lung)
Other known causes of pulmonary fibrosis include:
- Nitrofurantoin (Furadantin®, Macrodantin®, Macrobid®) and sulfasalazine (Azulfidine®), which are medicines used to treat ulcerative colitis, Crohn's disease, urinary tract infections, and rheumatoid arthritis
- Medicines to keep your heartbeat regular, such as amiodarone (Cordarone®) or propranolol (Inderal®)
- Chemotherapy or cancer medicines, such as methotrexate (Rheumatrex®), cyclophosphamide (Cytoxan®), and bleomycin (Blenoxane®)
- Radiation from cancer treatment.
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