What are the symptoms of neck cancer?

Lumps . Neck cancer usually implies metastatic disease from the ear, nose or throat. Progressive enlarging lymph nodes especially under the jaw area are of concern.
Ear pain/ weight los. Agree with dr. Astrachan. Any mass in the neck >2cm in an adult is of concern. It could be metastatic from another area (breast, colon, prostate). In the setting of tobacco and/or alcohol abuse, it could be from the oral cavity/airway. Cardinal symptoms: mass in neck; unexplained ear pain; change in voice; coughing blood; weight loss. See your local ENT for an evaluation.