Los tinnitus o acúfenos son un fenómeno perceptivo que consiste en notar golpes o sonidos en el oído, que no proceden de ninguna fuente externa. Pueden ser provocados por gran número de causas, generalmente traumáticas, ser producto de un síntoma de taponamiento de los oídos o de síndrome de Ménière. También pueden ser causados por situaciones de estrés por estudios, trabajo, entorno familiar, económico, social o exposición a ruido. El término se utiliza para describir cualquier tipo de sonidos que nazcan en los oídos o cabeza y que generalmente son audibles sólo por la persona afectada. Pueden ser pitidos o zumbidos que a veces son pulsátiles, percibiéndose a modo de latidos.

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Tinnitus is the hearing of sound when no external sound is present. While often described as a ringing, it may also sound like a clicking, hiss or roaring. Rarely, unclear voices or music are heard. The sound may be soft or loud, low pitched or high pitched and appear to be coming from one ear or both. Most of the time, it comes on gradually. In some people, the sound causes depression, anxiety or interferes with concentration. Tinnitus is not a disease but a symptom that can result from a number of underlying causes. One of the most common causes is noise-induced hearing loss. Other causes include: ear infections, disease of the heart or blood vessels, Ménière's disease, brain tumors, emotional stress, exposure to certain medications, a previous head injury, and earwax. It is more common in those with depression. The diagnosis of tinnitus is usually based on the person's description. A number of questionnaires exist that assess how much tinnitus is interfering with a person's life. The diagnosis is commonly assisted with an audiogram and neurological exam. If certain problems are found, medical imaging, such as with MRI, may be performed. Other tests are suitable when tinnitus occurs with the same rhythm as the heartbeat. Occasionally, the sound may be heard by someone else using a stethoscope, in which case it is known as objective tinnitus. Prevention involves avoiding loud noise. If there is an underlying cause, treating it may lead to improvements. Otherwise, typically, management involves talk therapy. Sound generators or hearing aids may help some. As of 2013, there are no effective medications. It is common, affecting about 10-15% of people. Most, however, tolerate it well with its being a significant problem in only 1–2% of people. The word tinnitus is from the Latin tinnīre which means "to ring".

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