Why do people get knocked out? Or lose consciousness -- especially after being hit in the head?

Question

nbarrera · Answer

Although there is currently no hard science on the matter, most doctors believe a knockout is typically caused by the brain bouncing around in the inside of the skull. It doesn’t necessarily have to be one really hard hit, but a series of hits that continuously cause your head to snap in all different directions with your brain rattling in the inside of your skull like a shake weight.Imagine that soft, mushy organ smacking against the inside of your cranium and those thin connective tissues being stretched and torn; that is what causes your brain to shutdown.