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MEDLINEPLUS: <p>Traumatic brain injury happens when a bump, blow, jolt, or other <a href='http://www.nlm.nih.gov/medlineplus/headinjuries.html'>head injury</a> causes damage to the brain. Every year, millions of people in the U.S. suffer brain injuries. More than half are bad enough that people must go to the hospital. The worst injuries can lead to permanent brain damage or death.</p><p>Half of all traumatic brain injuries (TBIs) are due to <a href='http://www.nlm.nih.gov/medlineplus/motorvehiclesafety.html'>motor vehicle accidents</a>. Military personnel are also at risk. Symptoms of a TBI may not appear until days or weeks following the injury. Serious traumatic brain injuries need emergency treatment.</p><p>Treatment and outcome depend on the injury. TBI can cause a wide range of changes affecting thinking, sensation, language, or emotions. TBI can be associated with <a href='http://www.nlm.nih.gov/medlineplus/posttraumaticstressdisorder.html'>post-traumatic stress disorder</a>. People with severe injurie
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