Imported post
<font color='#0000FF'>PARA , beat me to it.
Working underwater causes sweat = body temp starts to drop, so ambient water is cooling cooler blood , as your forehead has a large surface exposed to water, it is next door to a warm bit of grey matter, which can't really except a cold shock =ing a HEADACHE.
John, ref TMJ,,,,, the TMJ can be broken even by a sudden brake in your car, it's that fine....... It's also painful when it does goes, i should know, it's happen to me .
STORYTIME
Doing a salvage job at 43 mts, felt sore in my mouth near my upper left jaw, and put it down to the hard bit of choccie i had eaten just before diving. As i stuggle with the burning gear, i fell off the wreck to only 47 mts, I felt my mouth go bang, and thats the last i remember.
Once dragged to the surface, and it was a quick ascent as i was out for the count. The dive tenders un hatted my as i was choking on LOTS of blood, ( luckily i was wearing a COMMIE DIVE HAT ), having been rushed to hospital, it was found that one of my upper left double tooth had exploded,ripping a hole in my gum and the tooth splinters had cut my mouth to bits.
Had to wait 4 days before the dentist could have a good look at the damage, and by WRENCHING my mouth wide open with a ractchet thing , BROKE my TMJ,,,,,,, the bastard ,,,, was painful for a good 8 months and even worse , no diving for a year .
ANdy