Every now and then my 8 year old son s heart beats faster than normal. The thing is he isn t doing anything to cause it. He is sitting on the couch watching television. It happens mostly at night - it s not fear, and sometimes in the daytime. He is not hyper active. Does anyone have any idea what could be the cause of this? I have taken him to see a dr. He couldnt find anything. it pounds fast and hard. i dont know what to do... he isnt doing anything to cause it.. but i sit with him and try to get him to relax more.. :/ he is healthy, does not eat junk food. his weight is normal. he does not drink coke!