Fibrosis refers to an excessive deposition of extracellular matrix proteins and results in scarring and thickening of the affected tissue. It is, in essence, an exaggerated wound healing response that leads to organ malfunction. Fibrosis is commonly associated with high morbidity and mortality. Pulmonary fibrosis refers to a group of serious lung diseases that affect the respiratory system. It is caused by damage and scarring of the lung tissue. It cannot be cured, but its treatment involves management of symptoms through pulmonary rehabilitation and oxygen therapy. In some cases, lung transplantation can also help the patients. This book explores all the important aspects of pulmonary fibrosis. It presents researches and studies performed by experts across the globe on the pathophysiology and therapeutics for this medical condition. The extensive content of this book provides the readers with a thorough understanding of pulmonary fibrosis.