Often, the symptoms associated with head and neck cancers seem minor at first. You may experience a sore throat, difficulty swallowing, and hoarseness. In less serious conditions, these symptoms usually disappear on their own after a week or two; when cancer is the cause, they tend to persist without getting better. Other signs to watch for include a sore that doesn’t heal, bleeding from the mouth, swelling of the jaw, congestion and stuffiness, a sinus infection that doesn’t clear up with treatment, headaches, earaches, facial numbness and paralysis, swollen lymph nodes, and unexplained weight loss.