Head and neck cancer refers to cancers that develop in the throat, mouth, sinuses, and lymph nodes in the neck. The most common type is squamous cell carcinoma, which arises in the lining of the mouth, nose and throat. Staging involves determining if the cancer is localized, regional (spread to lymph nodes), or distant (metastasized). Treatment depends on the stage and location but may include surgery, radiation therapy, chemotherapy, and rehabilitation. Regular follow-up is important after treatment to monitor for recurrence or new cancers.