Im a 16 year old male and for the past nine months I have been getting really bad headaches. I have visited my doctor two times about this and he eventually referred me to see a consultant. The consultant told me it was not a brain tumor but is probably caused my tension sometimes though it feels like thiers fluid in my head or even pressure on the skull my back and neck sometimes ache too how does the doctor know this he hasn't even given me a brains can or taken any blood he just gave me a physical examination.