Pulmonary embolism is a potentially life-threatening condition in which an artery in the lung becomes blocked due to a blood clot. The most common symptom of a pulmonary embolism is sudden chest pain that is sharp and stabbing in nature. Other symptoms include shortness of breath, rapid heart rate, and coughing up blood. Diagnosis is made through a combination of physical examination, imaging tests, and blood tests. Treatment typically involves anticoagulant medications to prevent clot formation, clot-dissolving medications to break up existing blood clots, and in some cases, surgery to remove the clot. Prompt and appropriate treatment is essential for a successful outcome.