The Artist: John Mayer
When He Suffered Vocal Cord Damage: March 2012
How It Impacted Him: This was actually the second vocal cord injury of his career. After having a granuloma removed from one of his vocal cords in late 2011, it reappeared in early 2012 and required surgery. It forced him to take an "indefinite hiatus" and also caused him to cancel a bunch of tour dates.
Photo Credit: People