ENT doctors, also known as otolaryngologists, treat a wide range of ear, nose, and throat conditions, such as ear infections, hearing loss, balance disorders, ear-related birth defects, sinusitis, nasal congestion, allergies, nosebleeds, tonsillitis, swallowing disorders, head and neck cancers, thyroid disorders, salivary gland disorders, facial trauma, and sleep-disordered breathing disorders.