My 4 year old son spent the night at my sisters house last night. She sat him down on the bed and went to brush her teeth and shortly after he went to her and said something happened. There was a lamp that was on the night stand that was plugged in and had no light bulb screwed in. The lamp had a metal chain that you tug on to turn off and on. My son took the end of the chain and put it inside the lamp socket. He said when he did it he heard a noise and then the lights went out. He tripped the circuit breaker in 2 bedrooms. We asked him numerous times if he felt anything but denied he did. He seems fine and had no complaints. But I’m reading that you can have internal damage without physical symptoms. He seems completely fine and I called his pediatrician and he said not to worry about it. Should I be concerned about any possibility that it could have caused any current that could have reached his heart ? I’m worried because I also question whether my 4 year understands what I’m asking. I’m thinking because he had no pain afterwards he might think that shock he felt was nothing to acknowledge. Is it possible that there was no current or shock to him and the only issue was the circuit breaker tripping ? If he did feel a shock could it be the equivalent of if he stuck a piece of metal in the wall socket ? Thanks in advance.