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For millions of people living with gastroesophageal reflux disease (GERD), the familiar symptoms of heartburn and regurgitation are a daily burden. But a new large‑scale study from South Korea suggests that the impact of reflux may extend far beyond the digestive tract – potentially reaching the ears and contributing to tinnitus, the persistent perception of ringing or buzzing sounds with no external source [1].
The study, published in Scientific Reports, analysed data from over 660,000 individuals and found a striking association: people diagnosed with GERD had a more than sixfold higher risk of developing tinnitus compared to those without reflux disease [1]. This finding opens a new chapter in understanding how gastric reflux can affect seemingly unrelated parts of the body and underscores the importance of objective, non‑invasive reflux testing with tools like Pepfast.
Researchers followed a large cohort over time and documented new cases of tinnitus. The results were compelling:
Among GERD patients, the incidence of tinnitus was 14.91 cases per 1,000 person‑years.
In individuals without GERD, the incidence was only 1.74 cases per 1,000 person‑years [1].
After adjusting for potential confounders such as age, lifestyle factors, and other medical conditions, the hazard ratio for tinnitus in GERD patients remained significantly elevated (HR > 6) , indicating a strong and independent association [1].
The study’s authors propose several biologically plausible mechanisms linking GERD to tinnitus. Central to these hypotheses is the Eustachian tube, which connects the back of the throat to the middle ear and helps regulate pressure.
Direct reflux of gastric contents: Acid and the digestive enzyme pepsin may travel up the oesophagus, beyond the throat, and enter the Eustachian tube. Once in the middle ear, these irritants could disrupt the delicate environment of the inner ear.
Damage to key structures: Researchers believe that pepsin, in particular, could damage the round window membrane – a thin barrier between the middle and inner ear. Disruption of this membrane can alter fluid balance in the inner ear, a known contributor to tinnitus [1].
Inflammation: GERD is associated with chronic, low‑grade systemic inflammation. This inflammatory state might also affect auditory pathways, further increasing the risk of tinnitus.
These mechanisms are supported by earlier research linking reflux to middle ear dysfunction and conditions such as otitis media with effusion (glue ear).
The study also examined whether treatment with proton pump inhibitors (PPIs) – the most common class of acid‑suppressing medication for GERD – reduced the risk of tinnitus. Surprisingly, PPI use was associated with a slight increase in tinnitus cases, rather than a decrease [1].
There are several possible explanations:
PPIs do not stop non‑acid reflux: While PPIs effectively suppress gastric acid, they do not prevent the reflux of non‑acid gastric contents, including pepsin, which can still cause irritation and damage.
Magnesium depletion: Long‑term PPI use is known to reduce the absorption of magnesium, a mineral essential for protecting the inner ear from noise‑induced and other forms of damage. Magnesium deficiency has been linked to auditory dysfunction.
Persistent reflux symptoms: Many patients continue to experience reflux symptoms despite PPI therapy, reflecting the complex, multifactorial nature of the disease.
These findings highlight a critical point: symptom relief alone is not a reliable indicator of adequate reflux control, and objective testing is essential, especially for extra‑oesophageal manifestations like tinnitus.
Given that tinnitus may be an under‑recognised consequence of GERD, particularly when reflux reaches the upper airways, accurate diagnosis is key. Pepfast pepsin detection kit offers a simple, non‑invasive reflux test that detects the presence of pepsin in saliva. Since pepsin is produced only in the stomach, its appearance in saliva is a direct biomarker of gastric reflux.
For individuals with persistent unexplained tinnitus – especially if they also experience heartburn, regurgitation, hoarseness, chronic cough, or throat clearing – a pepsin test can provide objective evidence of reflux. This can help clinicians move beyond empirical PPI therapy and consider more comprehensive management strategies, including alginate‑based physical barrier therapies that block all gastric contents (acid and pepsin) from refluxing.
This research does not prove that GERD causes tinnitus, but it does suggest that reflux is an important, potentially modifiable risk factor. For patients suffering from both conditions, discussing this link with a healthcare provider could open new diagnostic and therapeutic avenues. For clinicians, it reinforces the importance of looking beyond the oesophagus when evaluating the effects of GERD.
1. Can acid reflux really cause ringing in the ears?
The study found a strong statistical association between GERD and an increased risk of tinnitus. Proposed mechanisms include reflux of stomach contents (acid and pepsin) into the middle ear, causing inflammation or damage to key structures like the round window membrane [1].
2. If I take PPIs for my reflux, will my tinnitus improve?
The study did not find that PPI use reduced tinnitus risk; in fact, it was associated with a slight increase. PPIs suppress acid but do not stop non‑acid reflux containing pepsin, which may still reach the ear. Long‑term PPI use may also deplete magnesium, which is important for hearing health.
3. How can I find out if reflux is contributing to my tinnitus?
Objective testing is essential. Pepfast is a non‑invasive saliva test that detects the presence of pepsin, a stomach enzyme and direct biomarker of reflux. A positive result provides evidence that gastric contents are travelling up to the throat – a necessary step for reaching the Eustachian tube and middle ear.
4. Should everyone with tinnitus be tested for reflux?
Not necessarily. However, for individuals with tinnitus who also have typical reflux symptoms (heartburn, regurgitation) or extra‑oesophageal symptoms (hoarseness, chronic cough, throat clearing), discussing a pepsin test with their doctor is a reasonable step.
[1] Kim SY, et al. Gastroesophageal reflux disease and the risk of tinnitus: a nationwide population‑based cohort study. Scientific Reports. 2025;15(3):11234.
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