That cancer usually starts in the cells lining of mouth, pharynx, or larynx and is called head and neck cancer. Mostly head and neck cancers are classified as squamous cell carcinoma which changes into a cancer cell. There are many types of head and neck cancers such as Oral cancer, Oropharyngeal cancer, Hypopharyngeal cancer, Laryngeal cancer, Nasopharyngeal cancer, Salivary gland cancer, Nasal cavity, and paranasal sinus cancer.