<unk>  is the perception of sound when no corresponding external sound is present. Nearly everyone will experience a faint "normal<unk> " in a completely quiet room but it is only of concern if it is bothersome or interferes with normal hearing or correlated with other problems. While often described as a ringing, it may also sound like a clicking, buzzing, hiss, or roaring. The sound may be soft or loud, low or high pitched, and often appears to be coming from one or both ears or from the head itself. In some people, the sound may interfere with concentration and in some cases it is associated with anxiety and depression.<unk>  is usually associated with a degree of hearing loss and with decreased comprehension of speech in noisy environments. It is common, affecting about 10–15% of people. Most, however, tolerate it well, and it is a significant problem in only 1–2% of all people. The word<unk>  comes from the Latin tinnire which means "to ring". Rather than a disease,<unk>  is a symptom that may result from various underlying causes and may be generated at any level of the auditory system and structures beyond that system. The most common causes are hearing damage, noise-induced hearing loss or age-related hearing loss, known as presbycusis. Other causes include ear infections, disease of the heart or blood vessels, Ménière's disease, brain tumors, acoustic neuromas (tumors on the auditory nerves of the ear), migraines, temporomandibular joint disorders, exposure to certain medications, a previous head injury, earwax; and<unk>  can suddenly emerge during a period of emotional stress. It is more common in those with depression. The diagnosis of<unk>  is usually based on the person's description. It is commonly supported by an audiogram, an otolaryngological and a neurological examination. The degree of interference with a person's life may be quantified with questionnaires. If certain problems are found, medical imaging, such as magnetic resonance imaging (MRI), may be performed. Other tests are suitable when<unk>  occurs with the same rhythm as the heartbeat. Rarely, the sound may be heard by someone else using a stethoscope, in which case it is known as objective<unk> . Occasionally, spontaneous otoacoustic emissions, sounds produced normally by the inner ear, may result in<unk> . Prevention involves avoiding exposure to loud noise for longer periods or chronically. If there is an underlying cause, treating it may lead to improvements. Otherwise, typically, management involves psychoeducation or counseling, such as talk therapy. Sound generators or hearing aids may help. No medication directly targets<unk> .
Tinnitus
Myopia
Gastroptosis
Cyclopia
Orofacial pain
Diplopia
Barodontalgia
Amblyopia