Paralysis happens when nerve signals to the muscles are disrupted, which takes away a person's ability to make voluntary movements. 

Some people are born with birth defects that cause paralysis, but more often, it's caused by a traumatic injury or medical condition that has damaged muscle and nerve function. 

In today's Medical Minute, News On 6 anchor Tess Maune has more about one man who stunned doctors who told him he’d never walk again.