Friend's son killed himself as a result of multiple concussions. My kids played football with him. He suffered 4+ concussions that we know of. He was a tough kid and wouldn't stay down. He went to college and couldn't shake the effects, never could get out of the "fog". As a result he suffered bouts of deep depression. No one saw it coming, but at age 24 he killed himself. Horrible tragedy. Point is, take concussions seriously. Especially your kid's concussions. It is life or death.