A concussion is a type of mild traumatic brain injury that occurs from a strong blow to the head. It can cause symptoms like headache, dizziness, fatigue, memory impairment, and mood changes.

A concussion occurs when you take a hit, jolt or movement that causes the brain to suddenly shift in your head. Although commonly associated with contact sports, the risk of obtaining a concussion can ...

For years, concussions were described as temporary disruptions in brain function that could not be seen on any medical test.