A concussion is a form of mild traumatic brain injury caused by sudden shaking of the brain inside the head. The brain sits inside the skull surrounded by cerebrospinal fluid. With a sudden hit to the head or other part of the body, the head can move quickly in one direction.
However, the brain stays where it is, “floating” in the fluid so to speak, until it is struck by the inside of the skull which bats the brain toward the opposite wall of the skull. The brain can bounce back and forth between the opposite sides of the skull several times before everything calms down. All of that commotion can cause bruising, bleeding and nerve damage.
of a Concussion