The reportedly leading causes of traumatic brain injury are, as follows:

a. Falls (28%); 

b. Motor vehicle accidents or traffic-related crashes (20%);
c. Person struck by/against (19%); and 

d. Assaults (11%).

Blasts are a leading cause of traumatic brain injuries for active duty military personnel in war zones.
Matthew L. White
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Founder & Partner of Louisville Personal Injury Law Firm Gray & White Law