If the trigeminal nerve in this area is compressed, or if there is local inflammation of the trigeminal nerve, it may cause local pain in the trigeminal nerve and cause discharge-like, cramp-like pain behind the ear. It is also possible that the pain may spread to the nerve pulling pain of the face or cause tooth pain. Second, it is possible that the pain is caused by enlargement and inflammation of the lymph nodes behind the ear. This condition is commonly associated with otitis media or upper respiratory tract infections such as acute pharyngitis, acute tonsillitis, acute bronchitis, etc., which affect the swollen and painful lymph nodes behind the ear.