The primary objective of this study is to investigate the correlation between changes from baseline to 52 weeks in Forced Vital Capacity (FVC) [% pred.] and changes from baseline to 52 weeks in dyspnea score [points] or cough score [points] as measured with the living with pulmonary fibrosis (L-PF) questionnaire over 52 weeks of nintedanib treatment in patients suffering from chronic fibrosing Interstitial lung disease (ILD) with a progressive phenotype (excluding idiopathic pulmonary fibrosis (IPF)).

Inclusion Criteria:

• Adults ≥ 18 years at Visit 1
• Subjects must be contractually capable and mentally able to understand and follow the instructions of the study personnel
• Physician's diagnosis of chronic fibrosing Interstitial lung disease (ILD) with a progressive phenotype, except Idiopathic pulmonary fibrosis (IPF)
• Initiation of nintedanib as first antifibrotic therapy according to physician´s decision which has been made as part of routine care prior to and independent of study inclusion
• Outpatients not currently hospitalized with a life expectancy > 12 months per investigator's assessment
• Written informed consent prior to study participation
• Current Forced vital capacity (FVC) measurement (taken within the last 3 months) available in the patient file
• Women of childbearing potential must take appropriate precautions against getting pregnant during the intake of nintedanib.

Exclusion Criteria:

• Patients with contraindications according to Summary of product characteristics (SmPC)
• Prior use of any antifibrotic treatment
• Lack of informed consent
• Pregnant or lactating females
• Any physician diagnosed exacerbation of Interstitial lung disease (ILD) in the patient's history file, irrespective of time since event
• Current diagnosis of lung cancer
• Respiratory failure (pH < 7,35 and/ or respiratory rate > 30/min) in the patient's history
• Participation in a parallel interventional clinical trial
• Patients being spouse or lateral relatives to the second degree or economically dependent from the investigator

Patients with chronic fibrosing Interstitial lung disease (ILD) with a progressive phenotype excluding Idiopathic Pulmonary Fibrosis (IPF) patients.

After the study is completed and the primary manuscript is accepted for publishing, researchers can use this following link https://www.mystudywindow.com/msw/datasharing to request access to the clinical study documents regarding this study, and upon a signed "Document Sharing Agreement".

Also, Researchers can use the following link https://www.mystudywindow.com/msw/datasharing to find information in order to request access to the clinical study data, for this and other listed studies, after the submission of a research proposal and according to the terms outlined in the website.

The data shared are the raw clinical study data sets.

After all regulatory activities are completed in the US and EU for the product and indication, and after the primary manuscript has been accepted for publication.

For study documents - upon signing of a 'Document Sharing Agreement'. For study data - 1. after the submission and approval of the research proposal (checks will be performed by both the independent review panel and the sponsor, including checking that the planned analysis does not compete with sponsor's publication plan); 2. and upon signing of a 'Data Sharing Agreement'.