chest pains whilst running

Anybody got any ideas about this one?
I'm a 34 year old, experienced runner, normally I train 6 days a week
between 3 and 8 miles a day. Over the last year, I've started
experiencing a sharp pain in the left side of my chest. its happened
around 5 or 6 times now and normally occurs when Im exerting myself for
long periods. it comes on very quickly and i have to stop immediately,
the pain immediately goes away. If I start running again the pain
returns. Ive asked my doctor about it and he says Ive pulled a muscle
in my chest. Im still a bit worried though. Any comments would be much
appreciated..

.

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  • Re: chest pains whilst running
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    (sci.med.cardiology)
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    ... I'm a 34 year old, experienced runner, normally I train 6 days a week ... between 3 and 8 miles a day. ... experiencing a sharp pain in the left side of my chest. ...
    (uk.rec.running)