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. source wikipedia
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Is tinnitus is dangerous?
Tinnitus is when you hear sounds in your head that aren't produced by the outside world – often in the form of buzzing or ringing. These sounds can be constant or intermittent. Tinnitus is not usually dangerous, but it can cause sleep loss, anxiety, fatigue, and stress. Tinnitus is a very common condition.