If almost everyone has it, it’s not really a condition.
Probably not a “get a cut and bleed” universal response. Finding out who has a hidden TBI (like the NFL players with CTE who commit suicide) had a breakthrough in 2013 but I haven’t checked the most recent studies. The studies have to be replicated, too.
There are ongoing Adult Stem Cell therapy studies, HBOT therapy, and others. Neuroscience is the most amazing and God glorifying science today.
Good news:
http://www.strokebreakthrough.com/tbi/
http://neurosciencenews.com/neuroscience-terms/tbi/
CTE found in living ex-NFL players
Traumatic brain injury triples risk for early death, study says
http://www.cbsnews.com/news/traumatic-brain-injury-early-death-risk/