Voice Care Center of Nashville", Mark A. Williams, M.D., PHD Our ENT specialists treat the full spectrum of ear, nose, and throat problems, from hearing loss, allergies, and sinus disease to thyroid and parathyroid disease and cancers of the head and neck. We also have a special interest in treating patients with sleep disorders (i.e., snoring and obstructive sleep apnea).. Balloon Sinus Dilation,Hearing Aid Services & Sales,Allergy Testing/Treatment,Pediatric ENT, Allergy Drops, Voice Care Services,Sleep Apnea,Thyroid/Parathyroid Surgery,Middle Ear/Mastoid Surgery,Head & Neck Cancer,Hearing Testing,Balance Testing