I have had a least 1 concussion in my adult life and a few probably when I was a kid although unknown... the one as an adult occurred 2 hours before I was to shoot a wedding... old mercedes wagon tail gate came down on the front corner of my head above my hair line... saw stars and and inch and a half cut... applied pressure and stopped the bleeding... shot the wedding but dont remember half the pics i took... the headaches were bad for about a day... no post issues i am aware of but i was stupid never went to a hospital. Now that I work in hospitals... as a CT Tech, I see them all the time.. the real danger is if there is a brain bleed... ps or too big of a brain bruise which is what a concussion is... different concussions and where they are effect people different ways... they are always risky for long term neuro disorders...