A concussion is a brain injury resulting from an abrupt hit to the head. It causes the head and brain to move back and forth quickly, resulting in a chemical change in the brain.
It may be difficult to determine if someone has suffered a concussion. The U.S. National Library of Medicine says key symptoms of concussion include:
- Convulsions or seizures
- Drowsiness or inability to wake up
- A headache that gets worse and does not go away
- Weakness, numbness or decreased coordination
- Repeated vomiting or nausea
- Confusion
- Slurred speech
- Loss of consciousness
Source: HealthDay
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