After 12 concussions, the last few resulting in coma (of various lengths) what will the repercussions be?

Avoid more concussio: Concussions cause cumulative brain damage. Repeated concussions have been assdociated with early onset of dementia , memory difficulty and slowed speed of mental processing of information. These complications may not be felt for several years or they may represent post concussion symptoms that take longer to resolve or may become permanent. You should avoid future concussions.