Musical ear syndrome (MES) is caused primarily by hearing loss. When the brain receives less sound input than it’s used to, it can begin generating its own auditory signals, producing phantom music that sounds completely real. The exact mechanism isn’t fully understood, but the pattern is consistent: the less sound reaching the brain, the more likely it is to fill in the gaps with music, singing, or other organized sound.
How Hearing Loss Triggers Phantom Music
The core explanation for MES is sensory deprivation. When hearing declines, whether gradually from aging or suddenly from illness or injury, the auditory processing centers in the brain lose their usual input. Rather than sitting idle, these regions become hyperactive and begin producing sound on their own. The result is music that no one else can hear.
This process is often compared to Charles Bonnet syndrome, where people with severe vision loss start seeing vivid visual hallucinations. In both cases, the brain is compensating for missing sensory data by generating its own. The analogy is so close that some researchers describe MES as “auditory Charles Bonnet syndrome.”
A 2021 study of 358 cochlear implant patients found that 33% experienced musical hallucinations either before or after implantation, with about 20% reporting them before the implant and 28% after. Notably, the patients who experienced MES were significantly younger on average (56 years versus 62 years), suggesting the condition isn’t limited to the very elderly, even though it’s more common in older adults.
What Happens in the Brain During Episodes
Brain imaging studies have revealed which areas light up during musical hallucinations. The most consistently involved region is the superior temporal gyrus, a strip of brain tissue heavily involved in processing sound and music under normal circumstances. During MES episodes, this area shows abnormally high metabolic activity, essentially working overtime despite no external sound reaching it.
But the superior temporal gyrus doesn’t act alone. Imaging has also shown increased activity in areas responsible for memory retrieval and emotional processing, including regions in the frontal lobe that appear to play a role in pulling stored musical memories back into conscious experience. One study using brain-wave imaging found that the orbitofrontal cortex, a region tied to decision-making and memory, activates during hallucinations and may be responsible for selecting which musical memories get “replayed.” This helps explain why people with MES typically hear familiar songs, hymns, or melodies from their past rather than random noise.
Fatigue, Silence, and Other Triggers
Hearing loss creates the underlying conditions for MES, but specific triggers can bring on individual episodes. Fatigue is one of the most common. In the cochlear implant study, fatigue triggered episodes in about 34% of patients who experienced musical hallucinations. Quiet environments are another frequent trigger, since the absence of competing sound gives the brain even less to work with, making it more likely to generate its own.
Many people notice episodes most often at night, when background noise drops and they’re lying in a quiet room. Social isolation can compound the problem for the same reason: fewer conversations and less environmental sound means less auditory input overall. Some people find that turning on a radio, fan, or white noise machine reduces or stops the hallucinations by giving the brain real sound to process.
Medications That May Play a Role
Certain medications can damage the inner ear or alter auditory processing, and in rare cases this contributes to musical hallucinations. Drugs that are ototoxic (harmful to hearing structures) represent the most direct medication-related cause. Among the drug classes most associated with ototoxicity, psychotropic medications are the second largest category. Case reports have documented musical hallucinations developing after months of use of specific antidepressants, resolving after the medication was stopped.
If musical hallucinations begin shortly after starting a new medication, it’s worth considering whether the drug could be accelerating hearing changes or directly affecting auditory processing.
How MES Differs From Psychiatric Hallucinations
One of the most important things to understand about MES is what it is not. Musical hallucinations are popularly associated with psychiatric disorders like schizophrenia, but the two conditions are quite different. In schizophrenia, auditory hallucinations are typically voices that speak to or about the person, often with threatening or commanding content. In MES, the hallucinations are musical, repetitive, and carry no personal messages.
A key difference is insight. People with MES almost always recognize, at least eventually, that the music isn’t real. They may initially assume it’s coming from a neighbor’s radio or a nearby room, but they don’t develop delusional beliefs about it. They don’t hear voices telling them to do things or believe the music carries hidden meaning. This preserved awareness is one of the main ways clinicians distinguish MES from psychiatric conditions.
Depression is the psychiatric condition most frequently seen alongside musical hallucinations, but even then the hallucinations are a separate phenomenon rather than a symptom of the depression itself. Musical hallucinations can also occasionally occur with epilepsy, though seizure-related episodes almost always come with other neurological symptoms that point toward the correct diagnosis.
Who Is Most Likely to Develop MES
The typical profile is an older adult with significant hearing loss, often living alone or in a quiet environment. But the condition is broader than that stereotype suggests. It affects people of all ages who have substantial hearing impairment, including those born with hearing loss and those who acquire it from noise exposure, infection, or other causes.
MES is rarely diagnosed despite being relatively common among people with hearing impairment. Many people never mention it to a doctor because they worry it signals dementia or a psychiatric disorder. Others simply don’t find it bothersome enough to bring up. In the cochlear implant study, only about 11% of those experiencing musical hallucinations found them intolerable. For the rest, the phantom music ranged from mildly annoying to neutral, and some people even found it pleasant.
The condition tends to be underrecognized in clinical settings partly because patients don’t report it and partly because many healthcare providers aren’t familiar with it. If you hear music that others can’t and you have any degree of hearing loss, the explanation is far more likely to be MES than a psychiatric or neurological emergency.