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Idiopathic pulmonary fibrosis (IPF)

The most common form of PF is Idiopathic Pulmonary Fibrosis (IPF). Idiopathic is a medical term that means the cause is unknown. Familial IPF is a term that maybe used when one or more family members are also affected by pulmonary fibrosis.  

Hypersensitivity Pneumonitis (HP)

Hypersensitivity pneumonitis is caused when the lungs react to repeated inhalation of a dust,most commonly from an occupation or hobby.

Classic examples of at-risk groups are pigeon breeders and farmers. For some people, hypersensitivity pneumonitis can reverse when there is no more exposure to the dust. For others, the condition can be progressive and behave like IPF.

Rheumatoid Arthritis Interstitial Lung Disease (RA-ILD)

Rheumatoid arthritis most commonly affects the joints, but the inflammatory process that underlies rheumatoid arthritis (RA) can also affect other parts of the body,including the lungs. One in 10 people with rheumatoid arthritis are likely to develop PF.


Sarcoidosis (where immune cells clump together to make small patches of swollen tissue called granulomas) is most commonly found in the lungs and skin. We know that it can be linked to the immune system not working at it should, but we don’t yet know why.

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