Head and neck cancer is a general term to describe a number of tumors that originate in the mouth and throat. Other cancers in the head and neck area include thyroid, skin, salivary glands and sinuses. But what are the specific cancer sites that fall into that category? Oral Cavity : Cancers found in the oral cavity are generally called mouth cancers. The cancer can develop in the lips, cheeks, teeth, gums, the front of the tongue, the floor and roof of the mouth, and the area found behind the wis...