A concussion is a tramatic brain injury that alters the way your brain function. Although the effects are usually temporary the effects can be delayed for hours or days and can last days to months. The effects include: headaches, and problems with concentration, memory loss, balance and coordination. Concussions are usually caused caused by a blow to the head or neck or upper part of the body. The cause of a concussion can be from a contact sport, a car accident, or even a kid falling on a playground. A concussion can cause loss of consciousness but most patients that have a consussion do not loose consciousness. A blow to the head, neck, or upper body can cause you brain to hit the walls of the skull violently. All concussions cause injury