Pulmonary embolism

Pulmonary embolism is a blood clot in the lung. It occurs when a clot, usually in the leg or pelvis, breaks free and gets stuck in a lung artery (pulmonary artery). The clot interrupts blood flow, making it more difficult for your lungs to provide oxygen to the rest of your body.

Signs and symptoms of pulmonary embolism may include:

• Sudden, sharp chest pain often with shortness of breath
• Sudden, unexplained shortness of breath, even without pain
• Cough that may produce blood-streaked spit
• Rapid heartbeat with shortness of breath
• Fainting
• Severe anxiety
• Unexplained sweating
• Swelling of one leg only, caused by a blood clot in the leg

Pulmonary embolism can be life-threatening. If you have symptoms of a pulmonary embolism, seek emergency medical help immediately.