High-resolution ultrasonographic imaging and 99mtechnetium pertechnetate scintigraphy are the most common diagnostic tools, whereas CT imaging and MRI are usually reserved for accurate location and preoperative planning. Although it is usually asymptomatic, lingual thyroid can lead to dysphagia, dysphonia with stomatolalia, bleeding, dyspnea, and as reported recently, OSA. The latter can be explained by a hypopharyngeal space-occupying lesion that compromises upper airway patency, especially in the supine position, because of its collapse toward the posterior pharyngeal wall. Other oropharyngeal and parapharyngeal masses reported to cause OSA by compressing the upper airway are lipoma, non-Hodgkin lymphoma, parotid tumor, plasmacytoma, paraganglioma, hemangioma, laryngeal cyst, lingual cyst, lingual tonsil hypertrophy, neurilemmoma, neurofibroma, and retention cysts. Indeed, any anatomic alteration or obstruction of the upper airway from the nasal ali to the trachea may cause OSA. Anatomic alterations of the pharynx that cause obstruction or malfunction of the eustachian tube's ventilation of the middle ear are known to cause recurrent middle ear infections and hypoacusia.