Pleurisy is inflammation of the pleura, the thin lining of tissue that surrounds the lungs. It causes sharp chest pain that worsens with breathing. The document discusses the types, causes, symptoms, diagnosis, and treatment of pleurisy. The main causes are infections like pneumonia, tuberculosis, and viruses. Diagnosis involves chest x-rays, fluid analysis, and other tests. Treatment focuses on the underlying cause through antibiotics, anti-inflammatories, pain medication, and procedures to drain fluid from the lungs.