Tinnitus

Tinnitus is the perception of sound when no corresponding external sound is present, often described as a ringing, it may also sound like a clicking, buzzing, hissing or roaring. It may be soft or loud, low- or high-pitched, and may seem to come from one or both ears or from the head itself.
It may interfere with concentration, and in some cases is associated with anxiety and depression.
Usually associated with a degree of hearing loss and 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.
Rather than a disease, tinnitus 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.

	Static	Dynamic
Conductive hearing loss	Acoustic shock Loud noise or music Middle ear effusion / Earwax Otosclerosis Eustachian tube dysfunction Temporomandibular joint disorders	Otitis media
Sensorineural hearing loss	Excessive or loud noise; e.g. acoustic trauma Presbycusis (age-associated hearing loss) Superior canal dehiscence Acoustic neuroma Mercury or lead poisoning Ototoxic medications	Ménière's disease Endolymphatic hydrops
Neurologic disorders:	Arnold–Chiari malformation Head injury Giant cell arteritis	Multiple sclerosis Migraine
Other causes	Temporomandibular joint dysfunction Metabolic disorders (Vit-B₁₂ / Iron deficiency) Psychedelic drugs Intracranial hyper or hypotension caused by cerebrospinal fluid leak	Psychiatric disorders such as Depression /Anxiety disorders Vasculitis Intracranial hyper or hypotension caused by encephalitis

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