Are concussions a form of brain injury? My son plays a lot of football and hockey.

In some instances, a series of mild head traumas may lead to brain injury. Concussions are a mild form of brain injury, and even though they are often considered temporary, a single concussion can stretch and tear nerve fibers in the brain. Most concussions do not show up on CAT scans, MRIs, or during a neurological exam. Some individuals who suffer mild concussions but never lose consciousness do not get a full neurological or medical workup, so the issue can remain undetected until later in life. Sometimes, symptoms appear after a person sustains a concussion or a series of concussions, including emotional, cognitive, and physical issues. The physical results of a concussion are referred to as Post-Concussion Syndrome.