It is estimated that more than 50 million Americans suffer from tinnitus, a condition where the patient experiences ringing or other head noises that are not produced by an external source. This disorder can occur in one or both ears, range in pitch from a low roar to a high squeal, and may be continuous or sporadic. This often debilitating condition has been linked to ear injuries, circulatory system problems, noise-induced hearing loss, wax build-up in the ear canal, medications harmful to the ear, ear or sinus infections, misaligned jaw joints, head and neck trauma, Ménière's disease, and an abnormal growth of bone of the middle ear.