4 year olds heart beat - very fast. Doctors, nurses please..?

my 4 year olds heart beat is very fast tonight. he went to bed early with a bit of a temperature and a stomach ache and now when i went to him his heart seamed to be beating twice the rate it should be. Should i be concerned about this or is it just his body's natural response to dealing with whatever is... show more my 4 year olds heart beat is very fast tonight. he went to bed early with a bit of a temperature and a stomach ache and now when i went to him his heart seamed to be beating twice the rate it should be. Should i be concerned about this or is it just his body's natural response to dealing with whatever is wrong with him?
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