That Ringing Is Only in One Ear — Here’s Why That Matters
Hearing a sound in one ear while the other stays quiet feels different from ordinary tinnitus. Most people find the asymmetry unsettling in a way that bilateral ringing isn’t — and that instinct is worth paying attention to. One-sided tinnitus does warrant closer attention than tinnitus in both ears, but the important thing to know upfront is that most causes are benign and many are fully reversible.
This article breaks down the causes of ringing in one ear in a way that most sources don’t: by urgency. You’ll find out which causes are common and easily treated, which ones need investigation but aren’t emergencies, and which specific warning signs mean you should seek same-day care. You’ll also get a clear picture of what a clinical workup actually looks like, so you know what to expect if you do see a doctor.
What Causes Ringing in One Ear Only?
Ringing in one ear only (unilateral tinnitus) is most commonly caused by earwax blockage, an ear infection, or noise exposure affecting one side — all of which are reversible with treatment. Less frequently, it signals inner ear conditions like Ménière’s disease or otosclerosis. Acoustic neuroma (a benign tumour on the hearing nerve) is the serious cause people worry about most, but it accounts for roughly 1–3% of cases in people who also have asymmetric hearing loss (Abbas et al., 2018); in unilateral tinnitus without hearing loss, the detection rate from MRI screening is just 0.08% (Javed et al., 2023). If the ringing started suddenly and came with hearing loss, treat it as urgent: the treatment window for sudden sensorineural hearing loss is narrow, and referral within 24 hours gives you the best chance of recovery (NICE, 2020).
The Most Common Causes: Benign and Often Reversible
The majority of people who notice ringing in one ear have a cause that resolves with straightforward treatment or on its own.
Earwax (cerumen) impaction — A build-up of wax in one ear canal changes the pressure environment and how sound reaches the cochlea, which can produce a phantom sound on that side. This is one of the most common causes of sudden-onset unilateral tinnitus. If an otoscope shows a blockage, professional earwax removal (microsuction or irrigation) often resolves it quickly. Don’t use cotton buds to clear it yourself — they push wax deeper.
Ear infection (otitis media or externa) — Fluid behind the eardrum or inflammation in the outer ear canal on one side disrupts normal sound transmission. The ringing usually fades once the infection clears, with or without antibiotics depending on the type. See a GP if you have ear pain, discharge, or fever alongside the ringing.
Asymmetric noise exposure — Standing with one ear closer to a speaker at a concert, using a single earbud for long periods, or a sudden acoustic event on one side (a gunshot, an explosion) can damage the hair cells in one cochlea while leaving the other intact. The resulting tinnitus may be temporary if the exposure was short. Avoid further loud noise while it settles and let a GP or audiologist assess if it persists beyond a few days.
Eustachian tube dysfunction — A cold, allergy, or rapid altitude change can create a pressure imbalance on one side. The tinnitus here tends to feel muffled rather than sharp, and often resolves once the congestion clears. Decongestants and nasal steroids can help; see a GP if it lasts more than a few weeks.
Causes That Need Investigation — Not an Emergency, but Don’t Ignore Them
Some causes of one-sided tinnitus are less common and require a proper clinical assessment, but they are manageable once identified. None of the following require a same-day emergency visit unless you also have sudden hearing loss or neurological symptoms.
Ménière’s disease — Classic Ménière’s starts in one ear and produces a distinctive cluster: low-pitched rumbling or roaring tinnitus, a sensation of fullness in the ear, episodes of vertigo, and fluctuating hearing loss. The tinnitus can precede other symptoms by months. Early diagnosis matters because without management the hearing loss can become permanent over time. If you have any combination of these features, an ENT referral is the right step.
Otosclerosis — Abnormal bone growth in the middle ear that stiffens the ossicular chain and gradually reduces hearing. It tends to start on one side and is more common in women. Tinnitus is often an early symptom. Surgery (stapedectomy) is highly effective when the condition is identified.
TMJ disorder — The temporomandibular joint sits directly in front of the ear canal. Jaw tension, grinding, or joint dysfunction can refer symptoms into the ear on one side, producing tinnitus that may worsen with jaw movement or chewing. A dentist or maxillofacial specialist can assess this. Management typically involves bite guards, physiotherapy, or stress reduction.
Acoustic neuroma (vestibular schwannoma) — This is the diagnosis many people fear when they search for unilateral tinnitus. It is worth understanding clearly. An acoustic neuroma is a benign, slow-growing tumour on the vestibulocochlear nerve. It typically develops gradually over months or years, with progressive one-sided hearing loss alongside the tinnitus. In patients referred for assessment with both asymmetric hearing loss and unilateral tinnitus, about 2.22% are found to have one on MRI (Abbas et al., 2018). In people with unilateral tinnitus but normal hearing, the pooled detection rate from MRI screening is just 0.08% (Javed et al., 2023). So while ruling it out matters, it is not the most likely explanation for most people who come searching with this symptom.
Red Flag Symptoms: When to Act Urgently
Most one-sided tinnitus does not require emergency care. The following presentations are the exceptions. What makes them different is that early action changes outcomes.
Sudden onset with hearing loss — If you noticed the ringing and hearing loss developing over hours or up to three days, and this happened within the past 30 days, NICE (2020) recommends referral to be seen within 24 hours. The reason is sudden sensorineural hearing loss (SSHL): a medical situation where rapid-onset inner ear damage may be partially reversible with corticosteroid treatment, but only if treatment starts promptly. The optimal window is within 72 hours; the guideline-sanctioned window extends to two weeks, but outcomes decline the longer treatment is delayed. Don’t wait for a routine GP appointment. Go that day.
Pulsatile tinnitus — If the sound in your ear beats in time with your heartbeat rather than being a constant tone, this is pulsatile tinnitus. It suggests a vascular cause rather than an inner ear or neural one. Possible explanations include arteriovenous malformation, dural venous sinus stenosis, or vascular tumours (Wang et al., 2024). Pulsatile tinnitus needs a different investigation pathway: CT angiography or MRI rather than a standard hearing test. Mention explicitly to your doctor that the sound pulses with your heartbeat.
Tinnitus with facial weakness, numbness, or drooping — This combination can indicate nerve compression or, in the most urgent scenario, stroke. If you have any neurological symptoms alongside new tinnitus, call emergency services or go to A&E immediately. NICE (2020) specifies immediate same-day emergency referral for tinnitus presenting alongside acute focal neurological signs.
Tinnitus after a head injury — Any new tinnitus following head or neck trauma warrants same-day assessment, as it may accompany inner ear damage or intracranial injury.
These presentations are uncommon. But they are the ones where acting quickly has a direct effect on what treatment is available to you.
The Diagnostic Pathway: What to Expect When You See a Doctor
Knowing what happens at each stage can make the process feel less daunting.
GP or primary care visit — Your doctor will take a history (how long the ringing has been there, whether it’s constant or intermittent, any other symptoms), examine your ear canal with an otoscope to look for earwax, infection, or perforation, and check your blood pressure. Based on findings, they’ll decide whether to treat directly, refer to audiology, or refer to ENT.
Audiologist — A pure-tone audiometry test checks for asymmetric hearing loss — hearing that is measurably worse in one ear than the other. Asymmetric hearing loss is itself a clinical red flag that typically prompts onward referral for imaging.
ENT specialist — If you have asymmetric hearing loss, unilateral tinnitus without a clear benign cause, or pulsatile tinnitus, an ENT may request MRI with gadolinium contrast, which is the standard imaging test for ruling out acoustic neuroma. For pulsatile presentations, CT angiography is the preferred first imaging step (Wang et al., 2024). The AAFP (2021) guideline supports MRI for unilateral tinnitus with asymmetric hearing loss.
Most people who go through this process are discharged after audiometry with a management plan. Imaging referral is a precaution taken in a minority of cases — not the default outcome for everyone with ringing in one ear.
Key Takeaways
- Ringing in one ear only warrants earlier medical attention than bilateral tinnitus, but most causes — earwax, ear infection, and asymmetric noise exposure — are benign and treatable.
- Sudden onset with hearing loss is a time-sensitive situation: seek same-day assessment, because early corticosteroid treatment (within 72 hours, ideally) gives the best chance of recovery (NICE, 2020).
- Pulsatile tinnitus — a beating sound in time with your heartbeat — needs a different investigation pathway (CT angiography or MRI) rather than a standard hearing test.
- Acoustic neuroma accounts for roughly 2% of cases in people with asymmetric hearing loss and unilateral tinnitus (Abbas et al., 2018), and just 0.08% in those with normal hearing (Javed et al., 2023) — important to rule out, but not the most likely explanation.
- Tinnitus alongside facial weakness, numbness, or other neurological symptoms is an emergency — call for help immediately.
Seeing a GP or audiologist promptly is the right move — not because something serious is likely, but because finding out quickly means better options.
