The Centers for Disease Control and Prevention (CDC) defines concussion as a traumatic brain injury (TBI) caused by a bump, blow, or jolt to the head or by a hit to the body that causes the head and brain to move rapidly back and forth. This sudden movement can cause the brain to bounce around or twist in the skull, stretching and damaging brain cells and creating chemical changes in the brain.
There may be signs of injury to the head, such as bruising or cuts, or there may be no visible injury. A person does not necessarily pass out after a concussion.
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