Professional contact sports have been in the headlines after a rash of player suicides, and the medical research continues.  A new study suggests the dangers of playing a hard-hitting sport may not subside after a player retires.

FOX's Colleen Cappon reports in today's "Housecall for Health":

New research shows further evidence that head trauma may lead to dementia.  A team at Boston University analyzed the brains of 85 former professional athletes with repetitive mild brain injuries, including 50 NFL players.

Sixty-eight percent showed evidence of chronic traumatic encephalopathy, which causes aggressive behavior and depression, and can advance to dementia and Parkinson's Disease.  The study is published in the journal "Brain."

Housecall for Health, I'm Colleen Cappon, FOX News Radio.