[Mark17]

Head injuries are risk for alzheimers and dementia and parkinsons, too.

Football injuries?

[Secret Agent Man]

From many different things. Concussions from a bad fall at work or the home, for example.

[Iceclimber58]

I had 3 concussions during my motorcycle racing days.
We sent a helmet back to Bell in the early 80’s. They liked to inspect crash damaged helmets.
Got a letter back from them wanting to know if the person wearing the helmet survived, and if so the extent of injuries.
Must have noticed the blood in liner.
I had some leakage from my ears and nose.