This document discusses pulmonary bleeding (hemoptysis). It defines hemoptysis as coughing up blood from the lungs or respiratory tract. The document outlines various causes of hemoptysis including infections like tuberculosis, lung cancers, vascular abnormalities and coagulation disorders. It also describes how to differentiate true hemoptysis from false, evaluates severity, provides clues from history and examination to suggest potential diagnoses, and lists relevant diagnostic tests and treatments.