A PE is a sudden blockage in a lung artery. The blockage usually is caused by a blood clot that travels to the lung from a vein in the leg, also known as a DVT.
A PE can be life-threatening. About one-third of people with an undiagnosed and untreated PE do not survive. When the condition is diagnosed and treated promptly, however, that number drops dramatically. If you experience a sign or symptom, contact your healthcare professional immediately.