Football has always been a dangerous game. Now researchers are learning more about the long-term effects professional players may be experiencing from career-related head injuries.

Moods shift. Personalities change. Memories are difficult to form and recall. All are signs of the brain breaking down over time and researchers are getting a better understanding of how to diagnose the condition.

Traumatic brain injuries are known to be a risk factor for later development of cognitive impairments. Recent findings suggest that even a singular brain injury could lead to diminished neurological capacity.