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I have no idea why this happens but whenever i start running outside, in warm or cold weather, after a few minutes into a jog i often get a really bad tightness and pain in the centre of my chest, this fades but for a few minutes i struggle to breathe properly as it hurts so much, i can quite happily run without any pains at all on a treadmill though, this only happens outside, at first i thought it was just the cold air but even running when its not cold does it. its only at the start of a run and leaves me a little wheezy but once its passed it doesnt usually come back,
does anyone have any idea what this is and how i can fix it? its a horible pain and is stopping me joining running clubs or running in more public places because i have to stop and bend over till its gone!