A Study to Test How Well a Medicine Called Nintedanib Helps People in China With Progressive Lung Fibrosis

Inclusion Criteria: * Written Informed Consent consistent with International Council on Harmonisation-Good Clinical Practice (ICH-GCP) and local laws signed prior to entry into the study (and prior to any study procedure including shipment of High-Resolution Computed Tomography (HRCT) to reviewer. * Male or female patients aged ≥ 18 years at Visit 1. * Patients with physician diagnosed Interstitial Lung Disease (ILD) who fulfil at least one of the following criteria for Progressive Phenotype within 24 months of screening visit (Visit 1) despite treatment with unapproved medications used in clinical practice to treat ILD, as assessed by the investigator: * Clinically significant decline in Forced Vital Capacity (FVC) % predicted based on a relative decline of ≥10% * Marginal decline in FVC % predicted based on a relative decline of ≥5-\<10% combined with worsening of respiratory symptoms * Marginal decline in FVC % predicted based on a relative decline of ≥5-\<10% combined with increasing extent of fibrotic changes on chest imaging * Worsening of respiratory symptoms as well as increasing extent of fibrotic changes on chest imaging \[Note: Changes attributable to comorbidities e.g. infection, heart failure must be excluded. Unapproved medications used in the clinical practice to treat ILD include but are not limited to corticosteroid, azathioprine, mycophenolate mofetil (MMF), n-Acetylcysteine (NAC), rituximab, cyclophosphamide, cyclosporine, tacrolimus\]. * Fibrosin…