My younger (12 year old) son had a spontaneous CSF leak. We believe it was a small leak as he was generally able to do basic activities, like go to school. There was no way he could go for a jog. Before the leak, he was very active in sports. Once he developed the leak (possibly due to sports but we may never know) his headache was constant - slightly better when lying down, worse when sitting or standing. No pain medicine we tried helped.

There are some excellent headache centers around that may be worth visiting.