The National | Mar 20, 2013 | 2:25

MMA concussion worries

Mixed martial arts fighting is growing increasingly popular, but doctors say repeated blows to the head can pose a danger to the brain

Now Playing on CBC Radio Help Refresh

Live audio streams for phones and tablets: Radio One and CBC Music (Radio 2, Radio 3 and more)

CBC Radio One

Listen Live Ottawa change

CBC Radio 2

Listen Live Eastern change

CBC Radio 3

Listen Live Radio 3