Why you might not feel pain until you notice a cut ( Link )
Except that (as far as I am aware) Tague did not have diabetic neurosis. Or leprosy. '
However, he makes a point that may help explain why Gov. Connally never felt the thigh wound which appears to me to have been made by a different bullet than the wrist wound (based on wound characteristics and trajectory):
"When a person gets injured, the immediate feeling should be that of pain. However, there are times when, for instance you sustain a cut, but you do not feel pain until you see the actual spot of the injury."
When it impacts a body. That person has a "concussion".
...
It is entirely possible that one of the fragments found in the front seat area struck the windshield or windshield frame and bounced back and struck him somewhere giving him a sensation of an impact. That may be what he was referring to. Unfortunately, his evidence on that was never clarified.