Often with a concussion you will have unequal pupils, vomiting, excessive sleepiness. However, I did hit my head hard a few times through out the years. Recently I had a brain scan because I lost my vision in one eye for a few minutes. Unrelated to the vision loss, it was discovered I have unusual calcifications in the brain with a few possible reasons, one of them being a trauma. So, yes injury can happen and I think that was a reasonable question. Now I have to have scans every six months to see if there are changes to rule out if this was something I was born with or as a result of injury.