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 difficulties. The exact cause is often unknown, but it can be associated with factors like long-term exposure to certain toxins, radiation therapy, or underlying health conditions such as rheumatoid arthritis. Symptoms of pulmonary fibrosis may include a persistent dry cough, shortness of breath, and fatigue. Diagnosis typically involves imaging tests like CT scans and lung function tests. While there is no cure, treatments can help manage symptoms and improve quality of life.