Tinnitus, the perception of sound without an external source, can be caused by a variety of conditions. Prevalence in the United States is approximately 10% to 15%. It can be categorized as primary (idiopathic and accompanied by or not by sensorineural hearing loss) and secondary (caused by a specific condition or problem other than sensorineural hearing loss). This guideline from the American Academy of Otolaryngology–Head and Neck Surgery Foundation (AAO–HNSF) provides guidance on the management of bothersome tinnitus lasting at least six months.