 [ Symptoms ] what exams and tests help doctors to evaluate or test people for hyperthyroidism [ Disease ] a flutter in your chest could be response to your anxiety condition since it also could be the result of medical problems such as afib it is recommended to follow up with your doctor the link below is for a webmd diagnostic tool that shows 26 possible reasons for the fluttering <link>|palpitations fluttering in chest&symptomids=17|175&locations=2|15 being 15 years old and playing soccer sounds great my gut feeling is that your flutter should be professionally evaluated but it probably just represents normal anxiety while engaged in a competitive activity best wishes for your success happiness and for a lifetime of good health