Bogart–Bacall syndrome (BBS) is a voice disorder that is caused by abuse or overuse of the vocal cords. People who speak or sing outside their normal vocal range can develop BBS; symptoms are chiefly an unnaturally deep or rough voice, or dysphonia, and vocal fatigue. The people most commonly afflicted are those who speak in a low-pitched voice, particularly if they have poor breath and vocal control. The syndrome can affect both men and women. Treatment usually involves voice therapy by a speech language pathologist.