Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
Here is a patient article that Clot Connect (University of North Carolina's Blood Clot Outreach Program) did on Protein C Deficiency:
http://patientblog.clotconnect.org/2011/06/15/protein-c-deficiency/
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