I've been having some wrist and thumb pain in my left hand recently with the pain being mostly after impact. A quick google search on the subject turned up some conflicting results.
In the golf digest article http://www.golfdigest.com/magazine/2011-09/fitness-avoid-injuries it says a strong left hand grip will reduce stress on the wrist.
Another article http://www.hss.edu/golfportal/tips-for-protecting-your-wrist-on-the-golf-course.htm advocates a weaker left hand position.
Both are fairly reputable sources but from very different backgrounds. Thoughts?