A couple of days ago, I noticed my heart appeared to be beating fast and my chest felt a little tight. I checked my pulse rate and it was over 100 - I had just got up in the morning so would have expected it to be on the low side.
I am 50 and consider myself to be fit. I go to the gym and run 4 - 5 miles on a treadmill 3 times a week. I am not overweight (BMI 23) and am otherwise healthy. I do not have any colds/viruses which could be causing increased pulse rate.
I have continued to check my pulse rate at intervals and it varys between high 80's when sitting down and 110 when standing up but not doing anything.
Do I need to be concerned about this and should I see a Doctor?