Pulmonary fibrosis is a lung disease that occurs when lung tissue becomes damaged and scarred. This thickening and stiffening of the tissue can make it difficult for the lungs to function properly, leading to breathing problems. The exact cause of pulmonary fibrosis is often unknown, but it can be associated with factors such as long-term exposure to certain toxins, radiation therapy, and some medical conditions. Symptoms of pulmonary fibrosis may include shortness of breath, a persistent dry cough, and fatigue. As the disease progresses, it can significantly impact a person's quality of life. While there is no cure, treatments are available to help manage symptoms and improve lung function.