Cystic fibrosis man qualifies as surgeon in York
13 May 2011 Last updated at 20:50 BST
Cystic fibrosis is one of the country's most common inherited diseases, and half of those with the illness are unlikely to live past their late 30s.
But Aaron Brown hasn't let this affect him. At just 26, he's recently qualified as a surgeon at York Hospital.
Penny Bustin caught up with him.