Hemoptysis refers to coughing up blood from the respiratory tract. It can range from a small amount of blood-tinged mucus to life-threatening massive hemorrhage. Common causes include infections, lung cancer, and vascular conditions. Evaluation involves assessing the type and amount of bleeding along with diagnostic tests like chest imaging, sputum analysis, and bronchoscopy. Treatment focuses on stabilizing the patient, stopping the bleeding, and addressing the underlying cause through techniques such as bronchial artery embolization, surgery, or medications. Complications can include asphyxiation, shock, and infection if not properly managed.