Justin Timberlake, Adele and Meghan Trainor have all experienced problems with their singing voices. Learn how these artists and others have recovered from various vocal injuries.

With cameras down their throats, metal singers show how they produce growls, screams, and squeals without damaging their vocal tissues.

Recently, actor Rajesh Khera underwent a surgery to remove a polyp from his vocal cord, a condition that had been affecting his voice. “I am so glad the procedure was successful,” he says.