What makes a head injury a concussion?

A concussion is a type of traumatic brain injury caused by a blow to the head or a sudden jolt that causes the brain to move within the skull. This movement can lead to chemical changes and damage to brain cells. Symptoms may include confusion, headache, dizziness, nausea, and balance problems. Diagnosis typically involves assessing the mechanism of injury and evaluating symptoms, often using standardized tests for cognitive function.