C.T.E is a condition that a person has when it suffer repeated brain injuries and it can affect a person's behavior. But, C.T.E may occur years or decades after the brain injuries and also it can cause abnormal build up of a protein called tau which it slowly kills brain cells.Overtime tau cells will begin to overwhelm the brain, killing many nerve cells and shrinking the brain roughly by half the size.
In some cases people who suffer from