Head and neck cancer refers to a group of cancers that develop in the tissues of the head and neck region, including the oral cavity (mouth), throat, voice box nasal cavity, sinuses, and salivary glands. These cancers can arise from various types of cells, including squamous cells lining the mucosal surfaces of the head and neck, as well as other cell types such as glandular cells or nerve cells. Head and neck cancer refers to a group of cancers that originate in the tissues of the head and neck region, which includes the mouth, throat, nasal cavity, sinuses, larynx (voice box), and salivary glands. These cancers often develop in the mucosal lining of these areas.