"The Boss" revealed that during the worst stages of his condition, he wasn't able to sing at all. Calling into Sirius XM's E Street Radio on March 21, Springsteen said, "You sing with your diaphragm.

“The Boss” was almost forced into retirement. “You sing with your diaphragm,” explained Springsteen. “My diaphragm was hurting so badly that when I went to make the effort to sing, it ...