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A concussion, also known as a mild traumatic brain injury (mTBI), is a head injury that temporarily affects brain functioning.
Symptoms may include loss of consciousness (LOC); memory loss; headaches; difficulty with thinking, concentration, or balance; nausea; blurred vision; sleep disturbances; and mood changes.
Common causes include motor vehicle collisions, falls, sports injuries, and bicycle accidents. Risk factors include drinking alcohol and a prior history of concussion. The mechanism of injury involves either a direct blow to the head or forces elsewhere on the body that are transmitted to the head.
Those who have already had one concussion seem more susceptible to having another.
At least 25% of concussion sufferers fail to get assessed by medical personnel.
In the US, athletes suffer from roughly 300,000 concussions every year.
In organized high school sports, concussions occur more often in competitive sports, with football accounting for more than 60% of concussions.
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