#asktheexpert hello doctor good morning, my son karthik 10 year old is having headache...he is complaining of headache backside of the skull...he says when he concentrate on something his headache starts n generally he shakes his body while having food n just seat's to watch TV. we have done X Ray also of his head but nothing came doctor said it may be because of sinus n cold....what could be the reason behind headache n body shaking? he is a hyper active boy always wants to do something n can't seat quiet for a while.