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.
http://sports.msn.com/en-us/nhl/article.aspx?aid=514708&acid=2&afid=&avid=66316
I always wondered what you would do, as an athlete, if you had to be on bloodthinners....some sports might be lower risk, but any contact sport, especially some of the hits those guys take....I don't know. Young guy too, only 26! Seems to be getting way more common with younger people.
And I don't even play in contact sports, so I understand his desire. I hope the best for him.