Head and neck cancer include those of the mouth, throat, sinuses/nasal cavity, larynx, thyroid, and skull base. Some head and neck tumors are malignant, while others are benign. Malignant tumors must be treated promptly to reduce their chances of spreading (metastasizing) to other organs. Benign tumors are not cancerous but It can increase the pressure in the head and neck. It can be serious if they impact nerves and are therefore often removed surgically.