Concussion is an interruption in normal brain activity usually due to a trauma to the head like a car accident or from a sports injury. Symptoms can include loss of consciousness, but because this does not happen in every case, many concussions go undiagnosed and untreated. Other symptoms that might occur are confusion and forgetfulness, nausea, vision problems, dizziness, and more.
Traumatic brain injury (TBI) is the result of a blow to the head or body with an impulsive force transmitted to the head. These can have different severity, the mildest of which is also called concussion. Common causes of TBI include participation in contact sports, falls, motor vehicle collisions, and assaults.