Most of the time minor concussions that involving being knocked out for a couple minutes or less usually don’t result in lasting brain damage although there is a risk. It’s the double impact - getting hit while the brain is inflamed from the first impact - that leads to the serious problems involving brain damage that I’ve experienced.

A kid getting knocked out for a few moments in a soccer game and then taken out of sports for a couple weeks is gonna see their grades drop in school for a month or so and have recurring headaches and mild memory and focus issues but they won’t be lasting and within a month the effects go away and are not life long. Now if they don’t get pulled out of the game and keep playing and sustain another hard hit they’re in trouble.

That’s what you’re seeing with the pro footballers and boxers and CTE when they hit their late 30s and 40s.