Recovery from a concussion is highly variable between individuals, but what we do know is that children take longer to recover than adults do and that some symptoms may subside while others will linger. Also, conditions such as Attention Deficit/Hyperactivity Disorder (ADHD), anxiety, and depression can prolong the recovery phase. Generally, simple concussions will progressively resolve between a week and ten days. Complex concussions will exhibit persisting, and perhaps worsening symptoms or seizure activity. What ever the case, children should avoid physical and cognitive exertion during the recovery phase of a concussion.