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A Clinical Trial Targets Tinnitus Through the Feet and Ears

Tinnitus affects between 12% and 30% of adults. For many, the persistent ringing or buzzing is not just a phantom sound; it is frequently linked to anxiety, poor sleep, and a stressed nervous system. Drug treatments have shown limited success and can cause side effects. A new trial now recruiting at Hualien Tzu Chi Hospital in Taiwan is testing two non-drug approaches: foot reflexology and a form of electrical ear stimulation. The FR-taVNS Tinnitus Trial aims to determine if these methods can reduce the severity of tinnitus and its associated distress by targeting the body’s autonomic regulation systems.

How the Trial is Structured

This is a randomized, single-blind, sham-controlled study. It will include 180 non-cancer adults who have tinnitus as their main complaint and have normal hearing thresholds. Participants are first sorted by age and sex, then randomly assigned to one of three groups: a foot reflexology (FR) group, a transcutaneous auricular vagus nerve stimulation (ta-VNS) group, or a usual-care control group. Critically, participants in the FR and ta-VNS groups are further randomized to receive either the true intervention or a convincing sham procedure. This design allows researchers to isolate the specific effects of the therapies from any placebo response.

The intervention period lasts one month. The foot reflexology protocol involves a 20-minute weekly session for four weeks, divided into phases for relaxation, inner-ear/autonomic regulation, and circulation. The sham version uses only light, non-specific touch. The ta-VNS protocol involves a 20-minute weekly session where a gentle electrical current stimulates specific points on the left outer ear. The sham ta-VNS targets the left earlobe at a very low current. Participants in both active groups also perform self-administered auricular acupressure with magnetic beads three times daily. Outcomes are tracked at baseline, week 2, week 4, and at a follow-up visit in week 8.

The Science Behind Targeting the Ear and Foot

The trial’s design is grounded in a growing understanding of tinnitus as more than an auditory problem. Researchers note its close association with autonomic dysregulation—an imbalance in the nervous system that controls stress responses, heart rate, and cortisol levels. This dysregulation may sustain the perception of tinnitus and amplify associated anxiety and sleep issues.

Foot reflexology is proposed to influence autonomic function through somato-autonomic reflexes, potentially promoting a relaxation response. Transcutaneous auricular vagus nerve stimulation (ta-VNS) works by directly stimulating a branch of the vagus nerve in the ear. The vagus nerve is a primary conduit for the parasympathetic nervous system, which calms the body. By modulating this system, ta-VNS may help reset the maladaptive neural activity linked to tinnitus. Measuring heart rate variability and salivary cortisol provides objective data on whether these interventions produce a measurable physiological shift.

Who Can Participate and Current Status

The trial is actively recruiting participants. To be eligible, individuals must be between 18 and 75 years old, have tinnitus as their sole chief complaint, and have normal pure-tone hearing thresholds. The study excludes people with objective tinnitus (sound generated inside the body), certain ear or cardiovascular diseases, skin lesions on the feet or ears, diabetes with poor control (HbA1c >7.5%), or implanted electronic devices like pacemakers. People who have had reflexology or vagus nerve stimulation in the previous three months are also excluded.

Potential Impact on Tinnitus Management

Results from this trial, expected after data analysis with generalized estimating equation models, could have a direct impact on patient care. Positive findings would provide strong evidence for incorporating structured reflexology or ta-VNS protocols into clinical practice for tinnitus. These therapies are attractive because they are non-invasive, have minimal known side effects, and could be administered by trained therapists or potentially through home-use devices in the future. For a condition where patients often feel hopeless due to a lack of effective treatments, demonstrating that modulating the body’s stress response can alleviate symptoms would mark an important advance. It would shift the treatment focus from just the auditory pathway to the interconnected systems of the brain and body that influence persistent tinnitus.

This article is for informational purposes only. Consult a qualified professional for personalised advice.

Source:
FR-taVNS Tinnitus Tria (ClinicalTrials.gov: NCT07711639)