The brain may still be injured even months after symptoms of a concussion have faded away.
Researchers at the University of New Mexico studied fifty people who had suffered mild concussions, comparing them to people without any brain injuries. While the mental and physical symptoms of concussion were gone four months later after suffering the injury, brain scans still showed abnormalities in the concussion patients.
The researchers say this shows thinking and memory issues improve much quicker than the brain itself, and it could change the process of determining when concussion patients are ready to resume physical activities. Athletes who suffer concussions typically are held out from participating for one to two weeks.