Concussion is the most common but least serious type of brain injury. Any severe signs of concussion require emergency medical treatment. Kids who sustain concussions usually recover within a week or two without lasting health problems by following certain precautions and taking a breather from sports. If the person fails to regain consciousness after two minutes, or the injury is very severe even if two minutes have not passed, do not move the person.
In complex concussions, symptoms persist and thought processes are affected and patients with repeated concussions would fall into the complex category. Repeat concussions cause cumulative effects on the brain. Healing or recovering from a concussion takes time, tt may take days to weeks, or even months.