Head injuries are injuries to the brain, skull or scalp, concussions are a type of head injury. A concussion is a brain injury caused by acceleration or deceleration of the brain within the skull following a significant impact to the head or elsewhere on the body. The impact causes a biochemical imbalance within the brain cells, resulting in decreased blood flow and temporary energy deficits within the brain. Symptoms may include loss of consciousness, headache, pressure in the head, neck pain, nausea or vomiting, dizziness, or balance problems, among others.
Concussions can occur with or without loss of consciousness and are considered the most minor of brain injuries, but concussions can still turn dangerous if they go untreated