Voice Box Cancer Larynx helps us breathe, speak, and swallow. Cancer that forms in any part of the larynx (voice box) is called laryngeal cancer. This cancer happens when cells grow uncontrollably. As the cells multiply, they invade and damage the body. The vocal cords are controlled by the laryngeal muscles and nerves, which can be damaged by cancer of the larynx and hypopharynx. Cancer of the larynx…