hi B., i myself have experienced this before. when i saw yours on here i just kind of laughed to myself because it brought back memories when my oldest did it. its nothing to worry about. i will tell you about mine. my 6yr old used to do this all the time. we would go to the stores and the malls and other places and he would get mad at us. he would bang his head on cement floors just because he wanted to. i dont know if it felt good to him or what but he started doing it just because he wanted to. at home we had a wooden rocker with cushions, he would bang his head on the cushions and if it didnt hurt him the first time he would move the cushions out of the way and start banging his head on the wood until it hurt. he wouldnt cry but maybe a minute or two and then he would proceed to do it again. i was in your shoes once. asking myself and my mom why is he doing this and we could never figure it out. i believe he did it for about a year or two. he finally grew out of it. maybe he got bored with it. we dont know. anyway, i hope this helps. your not the only one out there who has a child who does this. if you need to talk, feel free to talk to me anytime. god bless, R.