If you’re hearing sounds that don’t seem to have an outside source, whether it’s ringing, buzzing, whooshing, music, or your own heartbeat, your brain and ears are almost certainly producing a real, explainable phenomenon. The most common cause is tinnitus, which affects roughly 15% of adults, but several other conditions can make you hear unexpected sounds. What you’re hearing, when it happens, and whether it’s in one or both ears all point to different explanations.
Ringing, Buzzing, or Hissing Sounds
The classic phantom sound is tinnitus: a persistent ringing, buzzing, hissing, or whooshing that only you can hear. This is called subjective tinnitus, and it accounts for more than 99% of cases. It happens when damage to the tiny hair cells in your inner ear causes neurons in the brainstem to develop abnormal, synchronized firing patterns. Those misfiring signals travel up through the central auditory pathways and reach the part of your brain that processes sound, which interprets the activity as noise that isn’t there.
The most common triggers are noise exposure and age-related hearing loss. Even a single loud concert can set it off temporarily, while years of occupational noise or headphone use can make it persistent. But tinnitus also shows up alongside ear infections, earwax buildup, jaw disorders, head injuries, and high blood pressure. Stress and fatigue tend to make existing tinnitus louder or more noticeable, even though they don’t cause the underlying nerve changes.
Hearing Your Heartbeat in Your Ear
If the sound you’re hearing pulses in rhythm with your heartbeat, that’s pulsatile tinnitus, and it has a different set of causes. Unlike regular tinnitus, the sound is real. It’s generated by blood flowing through vessels near your ear, and sometimes a doctor can hear it too with a stethoscope.
Common vascular causes include narrowed arteries in the head or neck, high blood pressure, and abnormal blood vessel formations near the ear. One specific cause is a glomus tumor, a slow-growing mass that forms in the middle ear or near the jugular bulb. Glomus tumors are one of the most common reasons for pulsatile tinnitus, and they come in two main types: glomus tympanicum (small, in the middle ear) and glomus jugulare (larger, near the jugular vein and more complex to treat).
A less well-known structural cause is superior canal dehiscence syndrome (SCDS), where a tiny hole develops in the bone of the inner ear’s semicircular canal. People with SCDS can hear their own pulse, voice, stomach gurgling, and even their eyeballs moving, all abnormally amplified in the affected ear. This internal amplification of body sounds is called autophony. Diagnosis requires a specialized CT scan of the temporal bone.
Hearing Your Own Voice Too Loudly
If your own voice sounds booming or echoey inside your head, the most likely culprit is eustachian tube dysfunction. Your eustachian tubes connect your middle ears to the back of your throat and regulate air pressure. When they stay stuck open (a condition called patulous eustachian tube dysfunction), sound travels from your nasal cavity directly to your ears, distorting how your voice sounds. You may also notice muffled hearing, a feeling of fullness, or the sensation that your ears need to pop.
SCDS can produce a similar effect. The hole in the bone creates a “third window” in the inner ear that lets internal vibrations reach the hearing organs more directly, making your voice, breathing, and footsteps sound unnaturally loud on one side.
Hearing Music or Voices Without a Source
Hearing phantom music, singing, or voices is understandably alarming, but it often has nothing to do with psychiatric illness. Musical Ear Syndrome (MES) occurs when the brain’s auditory cortex compensates for hearing loss by replaying sounds stored in memory. With fewer real sounds coming in, the brain essentially entertains itself, and the result is vivid musical hallucinations that sound like they’re coming from outside your head.
The number one risk factor is significant hearing loss. Most people diagnosed with MES are over 60, which tracks with the natural increase in hearing loss with age. Stress and fatigue can trigger episodes. Some people experience MES for the first time after receiving cochlear implants, while others find that implants reduce their symptoms by giving the brain real sound to process again. MES works on the same principle as Charles Bonnet syndrome, where people with severe vision loss see vivid images that aren’t there. In both cases, the brain fills sensory gaps with stored information.
Loud Bangs or Crashes While Falling Asleep
If you hear a sudden, explosive sound right as you’re drifting off to sleep or waking up, you may be experiencing exploding head syndrome. Despite the dramatic name, it’s harmless. It’s classified as a sleep disorder and involves brief, startling sensory shocks, like a gunshot, cymbal crash, or loud bang, that seem to happen inside your head. There’s no pain, and the episodes last only a moment. Stress and extreme fatigue are the most commonly reported triggers, though researchers haven’t pinpointed a definitive cause. Episodes tend to come and go in clusters.
Medications That Can Cause Hearing Changes
Certain drugs are ototoxic, meaning they can damage structures in the inner ear and trigger tinnitus, muffled hearing, or both. The risk is highest with prolonged use or high doses. Drug classes most likely to cause hearing changes include macrolide antibiotics (like azithromycin and clarithromycin) taken long-term at high doses, high-dose aspirin, certain chemotherapy agents like cisplatin and carboplatin, and loop diuretics used for heart failure and kidney disease.
Combining two ototoxic drugs significantly increases the risk. Taking cisplatin and a loop diuretic together, for example, can cause far greater hearing loss than either drug alone. If you notice new ringing or muffled hearing after starting a medication, that connection is worth raising with your prescriber promptly, since some ototoxic effects are reversible if caught early.
Patterns That Signal Something Serious
Most phantom sounds are benign, but certain patterns are considered medical red flags. Tinnitus in only one ear is a common early sign of both vestibular schwannoma (a noncancerous growth on the hearing nerve) and Ménière’s disease. Sudden hearing loss in one ear with new tinnitus is treated as an otologic emergency, because early treatment within the first few days dramatically improves the chance of recovery.
Pulsatile tinnitus that starts suddenly also warrants urgent evaluation, as it can point to vascular problems in the brain. Any combination of tinnitus with facial weakness, severe vertigo, or persistent ear pain and drainage needs prompt attention. These combinations can indicate conditions ranging from cerebrovascular disease to tumors that are treatable when caught early.
How the Cause Gets Identified
The standard starting point is a hearing test (pure tone audiometry), which measures how well you detect sounds at different pitches through both air and bone conduction. This test alone can reveal patterns of hearing loss that point to specific causes. Most people with persistent unexplained sounds in their ears will also get speech discrimination testing and a pressure test of the eardrum called tympanometry.
If the tinnitus is one-sided or your hearing loss is uneven between ears, imaging is typically the next step. For pulsatile tinnitus, the type of imaging depends on whether the sound seems arterial or venous. Arterial causes are usually investigated with CT angiography of the head and neck, while venous causes may require MRI and magnetic resonance venography. For suspected SCDS, a high-resolution CT scan of the temporal bone is the key test. If Ménière’s disease is suspected, balance testing with electronystagmography helps distinguish it from other inner ear disorders.