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I've being running shorter distances for a few years but only this year starting increasing distance and doing my first HM in a couple of weeks.
I've started getting some odd chest pains, a high up tight feeling, at work though not when running. I suspect it is caffeine related (have read about it causing inflammation) and I have always drunk a lot of coffee and diet coke. Obviously I have cut down as much as possible, but would be interested to know if anyone else has experienced this and whetherr maybe it's partly due to the increased running as well.