Is this commonplace?

I had a concussion durning a football activity and it went away surrounded by about 2 mins?I have no side affects or anything,I was completly fine.Anyone hold a reason how this is possible?

Also another guy a couple games subsequently had a concussion and it last awhile.

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Answers:    A concussion is caused when an impact to the lead occurs. The brain hits the skull wall and purely like any other organ, it can act in response to an impact. There are many different level of concussion, some can last minutes and some can second hours or even days. The good word about them is that you do rest but how long you take to rest depends upon the impact on the brain.

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