Eustachian tube dysfunction — the tube linking the middle ear to the back of the nose failing to equalise pressure — can cause tinnitus alongside fullness, popping and muffled hearing, and it often follows a cold or a flight.
It is easy to overlook because the trigger feels so ordinary. A head cold or a descent into an airport does not seem like the start of an ear problem, so the ringing that comes with it tends to be put down to something else.
What the Eustachian tube does
The Eustachian tube connects the middle ear to the back of the nose and throat, and normally stays closed, briefly opening when you swallow, yawn, or chew to equalise pressure and drain fluid. When it doesn't work properly — staying too closed (the more common pattern) or, less often, staying abnormally open — the result is Eustachian tube dysfunction (ETD). It is common: research places adult ETD prevalence in the US at around 4.6%, a large enough share of the population that it's a reasonable thing to consider rather than an obscure diagnosis.
The symptom pattern
A 2015 consensus statement from an international expert panel, published in Clinical Otolaryngology, defines ETD by symptoms of pressure imbalance in the ear: aural fullness, popping, or discomfort and pain. People may also describe pressure, a clogged or underwater feeling, crackling, muffled hearing — and ringing. Symptoms commonly follow a cold, sinus infection, or allergic flare-up, since nasal and throat inflammation can directly affect how well the Eustachian tube opens and closes.
The panel also drew a line that is useful to know: ETD lasting less than 3 months is acute, and beyond that it is chronic.
After a cold, flu or flight
Each of these three triggers has its own evidence behind it, and it is worth taking them one at a time.
After a cold. The consensus statement notes that acute ETD of the ordinary, under-opening kind is often preceded by an upper respiratory tract infection, or sometimes by a flare of allergic rhinitis, which presumably inflames the opening or lining of the tube.
After flu. Some of the clearest evidence comes from experiments in which adult volunteers were deliberately infected. In one analysis of 316 volunteers infected with one of two rhinovirus strains or with influenza A, abnormal negative pressure in the middle ear developed in some of those infected — and about a third of the people who developed it did not report feeling ill at all. A follow-up study infected 18 adults with influenza A and measured their Eustachian tube function beforehand: after infection, middle-ear pressure fell and abnormal readings became more frequent, and the effect was more pronounced in ears whose tube had opened less reliably before the virus arrived. So blocked ears can come from a cold or flu that barely registered, and some people's tubes are more susceptible than others.
After a flight. The consensus statement describes a separate type, baro-challenge-induced ETD: fullness, popping or pain that starts when the surrounding pressure changes — typically on descent from altitude or when scuba diving. People are usually symptom-free once back at ground level, although a large pressure change can leave temporary fluid or blood behind the eardrum. A 2005 review of air-travel barotrauma describes the mechanism the same way: the tube fails to equalise middle-ear and cabin pressure, more usually during descent than ascent, producing fullness, pain and deafness, and in severe cases a perforated eardrum. A review for BMJ Clinical Evidence notes that symptoms usually resolve spontaneously.
A cold and a flight together. In a 2021 survey of 1,789 Finnish commercial aircrew, 85% reported having had middle-ear barotrauma in flight. Frequent upper respiratory infections were one of the factors most strongly associated with it: those reporting the most infections a year had about nine times the odds of those reporting none (odds ratio 9.02). Poor success at clearing the ears with a Valsalva manoeuvre was another. Aircrew fly far more than passengers, but the direction of the finding is the one most travellers suspect.
What helps on a flight has been tested in only a handful of trials. The 2005 review found three: oral pseudoephedrine reduced ear pain in adults with recurrent problems during air travel, it did not reduce in-flight ear pain in children, and an oxymetazoline nasal spray taken 30 minutes before descent did not significantly reduce barotrauma symptoms in adults. The BMJ Clinical Evidence review adds that nasal balloon inflation may reduce symptoms. Pseudoephedrine is a medicine with side effects and people for whom it is unsuitable, so it is a question for a pharmacist or doctor rather than something to take on the strength of this page. Traveling with tinnitus covers the rest of the journey, and diving, flying and ear barotrauma covers pressure injury in more depth.
How it connects to ear infections
When the Eustachian tube can't drain properly, fluid can build up behind the eardrum — a condition called otitis media with effusion (sometimes informally "glue ear," though that term is used more for the pediatric version). That fluid buildup on its own can cause muffled hearing and tinnitus even without infection; if the fluid becomes infected, it progresses to true otitis media (an ear infection), which adds pain and sometimes fever to the picture. Long-standing ETD is associated with a range of downstream middle ear complications beyond infection, including eardrum retraction, which is part of why chronic or recurring symptoms are worth a proper evaluation rather than repeatedly self-treating each episode.
A less common but distinct variant
Most ETD involves a tube that doesn't open enough. A less common form, called patulous Eustachian tube dysfunction, is the opposite: the tube stays abnormally open, which can let sound travel directly from your nasal and throat cavity into your ear — some people with this variant describe hearing their own voice or breathing unusually loudly, or even hearing the sound of their own pulse. If your symptoms include this specific pattern rather than fullness and muffled hearing, mentioning it precisely helps a clinician distinguish patulous ETD from the more common obstructive form, since the underlying mechanism — and sometimes the management — differs. Mention recent weight loss too, including on GLP-1 drugs such as Ozempic or Mounjaro.
What increases the risk
Upper respiratory infections and allergic rhinitis are the two most consistently cited triggers, since both cause the kind of nasal and throat inflammation that affects Eustachian tube function directly. Sinus infections and, less directly, structural issues in the nose or throat (like a deviated septum) can also contribute, and reflux reaching the back of the throat has been proposed as another; acid reflux and tinnitus covers how far that evidence goes. The overlap with allergies is worth knowing about specifically: if your tinnitus and ear fullness seem to track with allergy season or a chronic postnasal drip, ETD driven by ongoing nasal inflammation is a reasonable explanation to raise with a doctor, alongside standard allergy treatment. Allergies and tinnitus covers a large 2026 study linking allergic rhinitis with tinnitus, and what it does and does not establish.
What to do about it
- Short-term, cold- or allergy-related ETD often settles alongside the underlying congestion. Swallowing, yawning and chewing gum help the tube open actively, and treating an allergy treats one of the causes.
- Be realistic about sprays. A 2022 systematic review of medical treatment for adult ETD found no top-level evidence for any of it: about half of patients (50.3%) improved across the pooled studies, a figure that on its own cannot separate treatment from natural recovery, and steroid nasal sprays helped only 11% to 18% of chronic cases. A 2024 meta-analysis of randomised trials found steroid sprays no better than control at normalising middle-ear pressure tests (odds ratio 1.21, 95% CI 0.65–2.24). They remain a treatment for allergic rhinitis in its own right; the evidence that they fix the tube is weak.
- Persistent or recurring ETD — beyond the 3 months the consensus panel uses to define chronic, or troublesome sooner — is worth a proper ENT evaluation, which typically includes an ear exam and sometimes a tympanometry test (measuring how well your eardrum and middle ear respond to pressure changes) to confirm the diagnosis.
- A sudden drop in hearing is not safe to put down to a blocked tube. The US guideline on sudden hearing loss makes it a strong recommendation that clinicians distinguish sensorineural from conductive hearing loss when sudden hearing loss first presents, and emphasises testing hearing as soon as possible and within 14 days of symptoms starting. Sudden sensorineural hearing loss is the inner-ear kind, and it is time-sensitive.
- Severe pain, vertigo or a sudden hearing change after a flight or a dive also needs assessment. The 2005 barotrauma review notes that severe cases can rupture the eardrum or even the round window membrane — the route to a perilymph fistula.
- An ear that keeps discharging despite drops is a different problem and needs to be seen rather than re-treated. The sustained negative pressure ETD creates can draw part of the eardrum inward into a pocket, and a pocket is where a cholesteatoma starts — a skin growth that erodes what it presses against, and the one thing in this territory that needs surgery rather than time.
- Confirmed fluid buildup or infection may need more direct treatment, ranging from antibiotics for true infection to, for select chronic and treatment-resistant cases, procedures like balloon dilation of the Eustachian tube — a decision for an ENT to make based on your specific findings, not something to self-diagnose toward.