A concussion is a traumatic brain injury (TBI) that may result in a bad headache, altered levels of alertness, or
It temporarily interferes with the way your brain works, and it can affect memory, judgment, reflexes, speech, balance, coordination, and sleep patterns.
See also:
A concussion may result when the head hits an object or a moving object strikes the head.
A concussion can result from a fall, sports...
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Source: Harvard Decision Guide
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