p class=wp-caption-textThe vocal folds (seen from above) sit within the larynx, between the throat and the trachea. When hemorrhaging occurs on either flap, the normally flexible folds swell and impair proper functioning. Credit: Wikimedia Commons/p pYou would never have known it from her performance at the Grammy Awards ceremony on Sunday night, but the British singer Adele was not even allowed to speak for most of November and December. She had just undergone laser surgery to remove a polyp from her vocal folds , a small growth that forced her to cancel a U.S. tour and threatened to damage her sultry voice permanently. It was an extreme form of an injury that anyone can get simply by yelling too much./p a href=http://www.scientificamerican.com/blog/post.cfm?id=after-throat-surgery-british-singer-adele-makes-a-comeback-at-the-grammys[More]/a