Hi The last two times I have been running I have had some bad chest pains, It normally happens around the 2.1km mark during my daily 2.4km run. It has never happened befor but now it has happened twice im a little concerned. Im wondering if anyone on could give me advise on what it could be. The only thing I can think of it being is maby heart burn. Normally befor i go runningI just have a normal healthy meal. however today the last thing I ate was skittles about 2 and a half hours previous and on sunday I had ran out of my usuall all bran and had some coco pops instead. Could it just be heart burn or something more serious?