Can a blow to the head damage the brain?

Why do you say that, when the study which much of this thread has discussed showed a definite link?

I think the damage measured in soccer players would have occurred through clashes of heads and elbows to the head, as isaiahrobinson inferred.

If you play soccer over a long period of time you will experiences clashes of the head and elbows. I have, many times.

Just to add there was loud music, which made me disorientated. With every blow I became more dizzy and sleepy. I went to bed in the early evening that day. Should I be seeing a doctor about this event?

Thanks