Tinnitus. It's a ringing, whistling, hissing or whooshing in the ears — and it's surprisingly common.
An estimated 50 million Americans suffer from tinnitus — that includes about 1 million veterans. It's the most common injury from military service, and dozens of the people hurt in the Boston Marathon bombings have it as well.
There's no cure, but recently, researchers have begun to uncover some new clues about how tinnitus works.
- "Alan Starr remembers being blown back by the bomb’s force. He had come to watch a friend cross the Boston Marathon finish line on that fateful April day."
This segment aired on May 11, 2015.