Audiologists have a master’s or doctorate degree in audiology and specialize in evaluating and treating hearing loss and other issues related to the ear. Hearing Instrument Specialists are professionals specializing in fitting and dispensing hearing aids. Hearing Instrument Specialists undergo extensive educational and clinical training and are often state-licensed and board-certified to test for hearing loss and fit hearing aids. Otolaryngologists have a medical degree and can diagnose and treat ear, nose, throat, head, and neck disorders. Otolaryngologists are often called ENTs.