Fibrosis is a medical condition characterized by the excessive formation of fibrous connective tissue in an organ or tissue. This process can occur in various parts of the body, including the lungs, liver, and heart, often as a response to injury or inflammation. The buildup of fibrous tissue can lead to stiffness and reduced function of the affected organ. Common causes of fibrosis include chronic diseases, infections, and exposure to harmful substances. For example, pulmonary fibrosis affects the lungs, making it difficult to breathe, while liver fibrosis can progress to more severe liver damage. Early detection and treatment are essential to manage the condition effectively.