Traumatic brain injury

Also known as: Concussion
A concussion is a brain injury that is caused by a sudden blow to the head or to the body. The blow shakes the brain inside the skull, which temporarily prevents the brain from working normally.

Some people have obvious symptoms of a concussion (such as passing out or feeling lightheaded), while others do not. With rest, most people fully recover from concussions within a few hours to a few weeks.

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