Tinnitus

Tinnitus is often described as ringing, but it may also sound like clicking, buzzing, hissing, or roaring. Course Due to variations in study designs, data on the course of tinnitus shows few consistent results. Generally, prevalence increases with age in adults, and the ratings of annoyance increase with persistence at follow up. Adverse psychological effects Although it is an annoying condition to which most people adapt, persistent tinnitus may cause anxiety and depression in some people. Tinnitus annoyance is more strongly associated with the psychological condition of the person than the loudness or frequency range of the perceived sound. Psychological problems such as depression, anxiety, sleep disturbances, and concentration difficulties are common in those with strongly annoying tinnitus. One study found that complications can also include cognitive decline and difficulty communicating, and 45% of people with tinnitus in that study had an anxiety disorder at some time in their lives. Severe cases may lead some to consider suicide; while suicidal behavior is complex, tinnitus can be a risk factor. In a cross-sectional analysis, 15.75% of the 292 patients that attended a 2019 Tinnitus and Hyperacusis Clinic in the United Kingdom "expressed that they have been bothered by suicidal and self-harm ideations within the last 2 weeks." Psychological research has focused on the tinnitus distress reaction to account for differences in tinnitus severity. The research indicates that among the cohort studied, conditioning at the initial perception of tinnitus linked it with negative emotions, such as fear and anxiety. == Types ==

Commonly tinnitus is classified into "subjective and objective tinnitus". These otological or neurological disorders include those triggered by infections, drugs, or trauma. A cause is traumatic noise exposure that damages the sensory cilia, or hair cells, in the inner ear. Some evidence suggests that long-term exposure to noise pollution from heavy traffic may increase the risk of developing tinnitus. When there does not seem to be a connection with a disorder of the inner ear or auditory nerve, tinnitus may be called "non-otic". In 30% of cases, tinnitus is influenced by the somatosensory system; for instance, people can increase or decrease their tinnitus by moving their face, head, jaw, or neck. This type is called somatic or craniocervical tinnitus, since it is only head or neck movements that have the effect. When some frequencies of sound are lost to hearing loss, the auditory system compensates by amplifying those frequencies, eventually producing sound sensations at those frequencies constantly, even when there is no corresponding external sound. Hearing loss The most common cause of tinnitus is hearing loss. Hearing loss may have many different causes, but among those with tinnitus, the major cause is cochlear injury. In many cases, no underlying cause is identified. Ototoxic drugs also may cause subjective tinnitus, as they may cause hearing loss, This damage may occur even at doses not considered ototoxic. More than 260 medications have been reported to cause tinnitus as a side effect. Tinnitus may also occur from the discontinuation of therapeutic doses of benzodiazepines. It may sometimes be a protracted symptom of benzodiazepine withdrawal and may persist for many months. Medications such as bupropion may also cause tinnitus. Associated factors Factors associated with tinnitus include: • Ear problems and hearing loss: • Conductive hearing loss • Acoustic shock • Loud noise or music • Middle ear effusion • Otitis • Otosclerosis • Eustachian tube dysfunction • Sensorineural hearing loss • Excessive or loud noise; e.g. acoustic trauma • Presbycusis (age-associated hearing loss) • Ménière's disease • Endolymphatic hydrops • Superior canal dehiscence • Acoustic neuroma • Mercury or lead poisoning • Ototoxic medications • Neurologic disorders: • Chiari malformation • Multiple sclerosis • Head injury • Giant cell arteritis • Temporomandibular joint dysfunction • Metabolic disorders: • Vitamin B12 deficiency • Iron deficiency anemia • Psychiatric disorders • Depression • Anxiety disorders • Other factors: • Vasculitis • Some psychedelic drugs can produce temporary tinnitus-like symptoms as a side effect: • 5-MeO-DET • Diisopropyltryptamine (DiPT) • Benzodiazepine withdrawal This type of tinnitus is sometimes caused by an involuntary twitching of a muscle or a group of muscles (myoclonus) or by a vascular condition. In some cases, tinnitus is generated by muscle spasms around the middle ear, a condition called middle ear myoclonus. Pediatric tinnitus Children may be subject to pulsatile or continuous tinnitus, involving anomalies and variants of the vascular parts affecting the middle/inner ear structures. CT scans may be used to check the integrity of the structures, and MR scans may evaluate nerves and potential masses or malformations. Early diagnosis may prevent long-term impairments to development. Pulsatile tinnitus Some people experience a sound that beats in time with their pulse, known as pulsatile tinnitus or vascular tinnitus. Pulsatile tinnitus is usually objective in nature, resulting from altered blood flow or increased blood turbulence near the ear, such as from atherosclerosis or venous hum, but it may also arise as a subjective phenomenon from an increased awareness of blood flow in the ear. Vascular causes of pulsatile tinnitus include venous causes (e.g., high riding or dehiscent jugular bulb, sigmoid sinus diverticulum), arterial causes (e.g., cervical atherosclerosis, potentially life-threatening conditions such as carotid artery aneurysm or carotid artery dissection), or dural arteriovenous fistula or arteriovenous malformations. Pulsatile tinnitus may also indicate vasculitis, or more specifically, giant cell arteritis. Pulsatile tinnitus may also be caused by tumors such as paragangliomas (e.g., glomus jugulare), or hemangiomas (e.g., facial nerve or cavernous). Middle ear causes of pulsatile tinnitus include patulous eustachian tube, otosclerosis, or middle ear myoclonus (e.g., stapedial or tensor tympani myoclonus). The most common inner ear cause of pulsatile tinnitus is superior semicircular canal dehiscence. Pulsatile tinnitus may also indicate idiopathic intracranial hypertension. Pulsatile tinnitus may be a symptom of intracranial vascular abnormalities and should be evaluated for irregular noises of blood flow (bruits). == Pathophysiology ==

Tinnitus may be caused by increased neural activity in the auditory brainstem, where the brain processes sounds, causing some auditory nerve cells to become overexcited. Three reviews in 2016 emphasized the large range and possible combinations of pathologies involved in tinnitus, which result in a great variety of symptoms and specifically adapted therapies. == Diagnosis==

The diagnostic approach is based on a history of the condition and an examination of the head, neck, and neurological system. Evaluation of tinnitus may include a hearing test (audiogram), measurement of acoustic parameters of the tinnitus such as pitch and loudness, and psychological assessment of comorbid conditions such as depression, anxiety, and stress that might be associated with severity of the tinnitus. However, people with tinnitus often experience the noise more frequently than this. Tinnitus may be present constantly or intermittently. Some people with constant tinnitus might not be aware of it all the time, but only, for example, during the night or in situations when there is less environmental noise to mask it. Chronic tinnitus may be defined as tinnitus with a duration of six months or more. Audiology Since most people with tinnitus also have hearing loss, a pure tone hearing test resulting in an audiogram may help diagnose a cause. An audiogram may also facilitate fitting of a hearing aid in those cases where hearing loss is significant. The pitch of tinnitus is often in the range of the hearing loss. Psychoacoustics Acoustic qualification of tinnitus includes measurement of several acoustic parameters such as frequency in cases of monotone tinnitus or , loudness in dB above hearing threshold at the indicated frequency, , and minimum masking level. In most cases, tinnitus pitch or frequency range is between 5 kHz and 10 kHz, and loudness between 5 and 15 dB above the hearing threshold. Another relevant parameter of tinnitus is residual inhibition: the temporary suppression or disappearance of tinnitus following a period of masking. The degree of residual inhibition may indicate how effective tinnitus maskers would be as treatment. Hyperacusis An assessment of hyperacusis, a frequent accompaniment of tinnitus, may also be made. Hyperacusis is related to negative reactions to sound and may take many forms. One parameter that may be measured is Loudness Discomfort Level (LDL) in dB, which is the subjective level of acute discomfort at specified frequencies over the frequency range of hearing. This defines a dynamic range between the hearing threshold at that frequency and the loudness discomfort level. A compressed dynamic range over a particular frequency range may be associated with hyperacusis. The normal hearing comfort threshold is generally defined as 0–20 decibels (dB). Normal loudness discomfort levels are 85–90+ dB, with some authorities citing 100 dB. A dynamic range of 55 dB or lower is indicative of hyperacusis. Severity Tinnitus is often rated on a scale from "slight" to "severe" according to the effects it has, such as interference with sleep, quiet activities, and normal daily activities. Severe tinnitus has been associated with rarer variants. A broader assessment of general functioning, such as levels of anxiety, depression, stress, life stressors, and sleep difficulties, is also important in the assessment of tinnitus due to higher risk of negative well-being across these areas, which may be affected by or exacerbate the tinnitus symptoms. Current assessment measures aim to identify levels of distress and interference, coping responses, and perceptions of tinnitus to inform treatment and monitor progress. However, wide variability, inconsistencies, and lack of consensus regarding assessment methodology are evidenced in the literature, limiting comparison of treatment effectiveness. Questionnaires developed to guide diagnosis or classify severity of tinnitus may be treatment-sensitive outcome measures. Pulsatile tinnitus If examination reveals a bruit (sound due to turbulent blood flow), imaging studies such as transcranial doppler (TCD) or magnetic resonance angiography (MRA) should be performed. Differential diagnosis Other potential sources of the sounds normally associated with tinnitus should be ruled out. For instance, two recognized external sources of high-pitched sounds might be electromagnetic fields common in modern wiring and various sound signal transmissions. A common and often misdiagnosed condition that mimics tinnitus is radio frequency (RF) hearing, in which subjects hear objectively audible high-pitched transmission frequencies that sound similar to tinnitus. == Prevention ==

Prolonged exposure to loud sound or noise levels can lead to tinnitus. Custom made ear plugs or other measures may help with prevention. Employers may use hearing loss prevention programs to help educate and prevent dangerous levels of exposure to noise. Government organizations set regulations to ensure employees, if following the protocol, should have minimal risk to permanent damage to their hearing. Certain groups are advised to wear ear plugs to avoid the risk of tinnitus, such as that caused by overexposure to loud noises such as wind noise for motorcycle riders. This includes military personnel, DJs, agricultural workers, and construction workers as people in those occupations are at a greater risk compared to the general population. Several medicines have ototoxic effects, which can have a cumulative effect that increases the damage resulting from loud noise. == Management ==

If a specific underlying cause is determined, treating it may lead to improvements. Psychological The best-supported treatment for adapting to high stress that might be associated with tinnitus is cognitive behavioral therapy (CBT). This appears to be independent of any effect on depression or anxiety. Acceptance and commitment therapy (ACT) also shows promise in the treatment of tinnitus. Relaxation techniques may also help. Sound-based interventions The application of sound therapy by either hearing aids or tinnitus maskers may help the brain ignore the specific tinnitus frequency. Although these methods are poorly supported by evidence, there are no negative effects. There are several approaches for tinnitus sound therapy. The first is sound modification to compensate for the individual's hearing loss. The second is tailored music therapy, notched at the tinnitus frequency, which may affect lateral inhibition of the notched neural region, suppressing tinnitus. There is some tentative evidence supporting tinnitus retraining therapy, which aims to reduce tinnitus-related neuronal activity. Such applications can work as a separate device or as a hearing aid control system. Neuromonics is another sound-based intervention. Its protocol follows the principle of systematic desensitization and involves a structured rehabilitation program lasting 12 months. Neuromonics therapy employs customized sound signals delivered through a device worn by the patient, which aims to target the specific frequency range associated with their tinnitus perception. Physical therapy Physical therapy for tinnitus focuses on relaxing jaw and neck muscles that may contribute to symptoms. Muscle tension, particularly in the jaw muscles such as the masseter and medial pterygoid, may radiate to the ears, leading to somatic tinnitus. Specialized physical therapists use neuromuscular techniques to alleviate tension in these areas, which may reduce tinnitus intensity and the associated pain in connected areas, such as the jaw, teeth, and ears. Medications there were no medications effective for idiopathic tinnitus. There is not enough evidence to determine whether antidepressants or acamprosate are useful to treat tinnitus. There are conflicting studies regarding the effectiveness of benzodiazepines for tinnitus. As of 2015, the usefulness of melatonin is unclear. It is unclear whether anticonvulsants are useful for treating tinnitus. Steroid injections into the middle ear also do not seem to be effective. There is no evidence to suggest that the use of betahistine to treat tinnitus is effective. Botulinum toxin injection has succeeded in some of the rare cases of objective tinnitus resulting from a palatal tremor. In 2009, use in a few countries of caroverine to treat tinnitus was published. Upon review, the evidence for its usefulness was very weak. Neuromodulation In 2020, information was reported about clinical trials indicating that bimodal neuromodulation may reduce the symptoms of tinnitus. It is a noninvasive technique that involves applying an electrical stimulus to the tongue while also administering sounds. The Lenire bimodal neuromodulation device marketed by Neuromod was approved as a treatment option for tinnitus in March 2023 by the United States Food and Drug Administration (FDA). In June 2024, the United States Department of Veterans Affairs (VA) announced it would begin offering the treatment to veterans with tinnitus, making it the first bimodal neuromodulation device to be awarded a Federal Supply Schedule (FSS) contract from the U.S. Government. transcranial direct current stimulation, and neurofeedback. Stéphane Maison, an auditory physiologist at Massachusetts Eye and Ear Infirmary, noted in 2023, "Our work reconciles the idea that tinnitus may be triggered by a loss of auditory nerve, including in people with normal hearing... We won't be able to cure tinnitus until we fully understand the mechanisms underlying its genesis. This work is a first step toward our ultimate goal of silencing tinnitus". The study follows studies that established that treatment with neurotrophins demonstrated encouragement for repair of the nerve in other mammals and the findings should lead to investigation of the potential for a treatment for tinnitus in humans. Alternative medicines not effective A 2013 report indicated that Ginkgo biloba does not appear to be effective as a treatment for tinnitus. The American Academy of Otolaryngology recommends against taking melatonin or zinc supplements to relieve symptoms of tinnitus, and reported in 2014 that evidence for the efficacy of many dietary supplements (such as lipoflavonoids, garlic, traditional Chinese/Korean herbal medicine, honeybee larvae, and various other vitamins and minerals, as well as homeopathic preparations) did not exist for tinnitus. == Prognosis ==

While there is no cure, over time most affected people adapt to living with tinnitus; for a minority, it remains a significant problem. == Epidemiology ==

Adults Tinnitus affects 1015% of people. Tinnitus affects one third of adults at some time in their lives, whereas 10–15% are disturbed enough to seek medical evaluation. In Europe, 70 million people are estimated to have tinnitus. Children Commonly thought of as typically affecting adults, tinnitus often is overlooked in children. Even though children do not express the condition or its effect on their lives, children with hearing loss have a high incidence of pediatric tinnitus. Children do not generally report tinnitus spontaneously and their complaints may not be taken seriously. Among children who do complain of tinnitus, there is an increased likelihood of associated otological or neurological pathology such as migraine, juvenile Meniere's disease, or chronic suppurative otitis media. Its reported prevalence varies from 12 to 36% in children with normal hearing thresholds, and up to 66% in children with a hearing loss. Approximately 3–10% of children have been reported to be troubled by tinnitus. == See also ==