As an ex-football player and have had as many as 12 concussions, I am. After a severe concussion in 2006 where I was out for several minutes. I was not wearing a helmet and ran head first into another Guy after which the back of my head slammed down on a gym floor
Symptoms include : memory impairment, emotional instability, erratic behavior, severe depression, loss of attention, dizziness, headaches, sensitivity to light and noise, difficulty swallowing, suicidal thoughts, clumsiness, difficulty processing, blank stares...

Seems like every month another football player commits suicide and is found to have had Chronic Traumatic Encephalopathy (CTE) which is a buildup of the protein Tau in the brain caused by repeated head trauma.
I have lost a couple of jobs I'm the last few years, forgotten how to drive home and even couldn't remember my son's name, which really crushed me