(HealthDay News) -- A concussion is a brain injury that's generally caused by a strong blow to the head.
The American Academy of Family Physicians says symptoms of a concussion may include:
- Headache.
- Changes in vision.
- Feeling dizzy.
- Difficulty with balance.
- Confusion or memory loss.
- A ringing sound in the ears.
- Inability to concentrate.
- Feeling nauseous.
- Grogginess.
- Sensitivity to sound or light.
