[adax]

Hi Roger,

I had the same after my first dives (dynamic in pool), but only after surfacing, never during the dive. It was sharp pain in the back of my head. Fortunatelly after some time of very irregular training, it disappeared.

I think it has something to do with the brain blood vessels accomodating to the lack of O2 (or rather while returning back from the low O2 state). I think the vessels also have to get used to it gradually by training (like muscles).

The best way to avoid it is not to push too hard, let the body accomodate slowly to the new situations you put it in.