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Concussion, also known as mild traumatic brain injury (mTBI) is typically defined as a head injury with a temporary loss of brain function. Symptoms may include headache, trouble with thinking, memory or concentration, nausea, blurry vision, sleep disturbances, or mood changes. Fewer than 10% of sports-related concussions among children are associated with loss of consciousness. It is not unusual for symptoms to last up to four weeks.
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