Usually people recover from concussions in a few days, or weeks at most. But 1-10% will still have symptoms three months later.
More needs to be done to manage concussions in road cycling.
Football could take a leaf from rugby union's book on how to treat head-injured players, pitch side.
All parents should understand the symptoms of concussion, whether their child plays sports or not.
As students return to school and prepare to join sports teams, here's what they and their parents need to know about concussions.
The myth that a blow to the head can both cause and cure amnesia – a common one on TV and in the movies – may have begun during the 19th century.
Once the stuff of tweeting birds and rolling cartoon eyes, bumps on the head are now linked to dementia. Will Smith's latest movie tells how sports authorities tried to cover it up.
The death of a 23-year-old boxer has prompted a call by the Queensland branch of the Australian Medical Association for the sport to be banned in Australia.