The purpose of this study is to determine if pulmonary rehabilitation has any effect on breathlessness, quality of life, physical function and depression in persons with interstitial lung disease.

Inclusion Criteria:

• Adults (> 18 years old) with a diagnosis of ILD who are referred to a participating PR program

Exclusion Criteria:

• Inability to provide informed consent
• Inability to read and write English
• Any other medical condition that significantly limits the subject's ability to perform the functional measures
• Emphysema / Chronic bronchitis (FEV1 / FVC ratio < 60%)
• Previous pulmonary rehabilitation

Any patient with interstitial lung disease who is referred to a participating pulmonary rehabilitation program. These patients typically have exercise limitation and dyspnea, but still possess the ability to perform some exercise.