Other possible symptoms of NPC include: 1  Hearing loss, ringing in the ear, or feeling of fullness in the ear (especially on one side only) 2  Ear infections that keep coming back. 3  Nasal blockage or stuffiness. 4  Nosebleeds. Headache.  Facial pain or 1  numbness. Trouble opening the 2  mouth. Blurred or double  vision.