A diagnostic framework for an environmental exposure that is rarely screened for and frequently misattributed.
Residential exposure to infrasound and low-frequency noise (sub-200 Hz, with particular clinical relevance below 20 Hz) is increasingly documented in peer-reviewed literature as producing a recognizable cluster of physiological and neurological effects. The exposure is structurally invisible to standard environmental measurement, and the symptom presentation overlaps substantially with anxiety, PTSD, vestibular disorders, and somatic symptom presentations. As a result, patients experiencing genuine environmental exposure are frequently treated for psychiatric or idiopathic conditions while the underlying stimulus continues uninterrupted.
This page is a clinical reference for physicians, nurse practitioners, audiologists, ENTs, cardiologists, and mental health clinicians who may be seeing affected patients without an existing diagnostic framework to recognize the pattern.
Chronic residential infrasound and low-frequency noise exposure produces a recognizable constellation of symptoms. No single symptom is specific to this exposure; the diagnostic value lies in the cluster and its environmental correlation.
Tinnitus without measurable hearing loss, aural fullness, ear pressure, episodic vertigo, body sway, sensation of motion when stationary. Endolymphatic hydrops has been investigated as a possible mechanism — see ClinicalTrials.gov NCT03132961 (Effects of Infrasound Exposure on Measures of Endolymphatic Hydrops, University of Minnesota). Otoacoustic emissions changes have been documented at exposure frequencies as low as 6–12 Hz.
Headaches, cognitive impairment, difficulty concentrating, mental fog, sensitivity to sound and light. Sleep disruption is among the most consistently reported symptoms — typically characterized by difficulty achieving or maintaining deep sleep rather than initiation insomnia. Ascone et al. (2021), in Scientific Reports, documented regional grey matter volume changes in the cerebellum and angular gyrus following 28 nights of 6 Hz, 80–90 dB residential infrasound exposure.
Palpitations, elevated resting heart rate, blood pressure variability. Chaban et al. (2021), in Noise & Health, demonstrated reductions in human atrial myocardial contractility at sustained exposures above 100 dBz at 16 Hz, with a recommended chronic exposure limit of 80 dBz. Large population cohort data from the Gutenberg Health Study has documented associations between noise annoyance and atrial fibrillation prevalence. Patients with pre-existing AFib or implanted cardiac devices warrant particular attention.
Salivary cortisol elevation has been demonstrated in controlled exposure studies. Scatterty et al. (2026), in Frontiers in Behavioral Neuroscience, exposed 36 adults to 18 Hz infrasound via hidden subwoofers and documented elevated cortisol and self-reported irritability even when participants could not consciously detect the infrasound. Chronic HPA-axis activation is the most likely upstream driver of many downstream symptoms.
Flank or kidney-region pain (resonant frequencies of solid abdominal organs fall within the 4–10 Hz range), abdominal pressure, paresthesias in extremities. Vibroacoustic Disease literature documents structural changes in chronically exposed populations, though most VAD research is in occupational rather than residential contexts.
Anxiety, irritability, depressive symptoms, hypervigilance. These are downstream of sleep loss and HPA-axis dysregulation rather than primary. Crucially, these symptoms often lead to a psychiatric working diagnosis that becomes the lens through which all subsequent presentations are interpreted, obscuring the environmental cause. Baliatsas et al. (2016), in a systematic review in Science of the Total Environment, found consistent associations between low-frequency noise and self-reported neurological and psychiatric outcomes in the general population.
"Do your symptoms improve when you sleep somewhere other than your home for two or three nights, and return when you come home?"
Location-dependence is the strongest clinical signal that an environmental exposure is contributing. Psychiatric and most idiopathic conditions follow the patient. Environmental exposures do not.
If the patient has not tested this, suggesting a structured three-night trial away from the residence with a simple symptom log (sleep quality, headache severity, tinnitus presence, pressure sensations — each rated 1–10 daily) provides high-value diagnostic data at zero cost.
For patients presenting with this symptom cluster and a positive location-dependence history, the following workup is reasonable to consider:
The goal is not to "diagnose infrasound exposure" — there is no ICD-10 code for it — but to document the symptom pattern and rule out other causes systematically. The medical record becomes important supporting documentation if the patient pursues environmental remediation, lease termination, habitability claims, or legal action.
Patients with combat-related PTSD are at particular risk of having infrasound exposure missed. PTSD and chronic low-frequency exposure share substantial neurobiological overlap (HPA-axis dysregulation, hyperacusis, sleep disruption, hypervigilance). A veteran whose PTSD treatment is unexpectedly treatment-resistant, or whose symptoms worsened after a residential change, should be screened for environmental exposure as a possible co-contributor. See PTSD UK on hyperacusis and PTSD.
The presence of a psychiatric history does not preclude genuine environmental exposure. Differentiation rests on location-dependence, temporal correlation with neighbor activity, and novel symptom emergence (particularly vestibular and visceral) that is not characteristic of the prior diagnosis.
Chronic infrasound exposure has documented direct effects on myocardial contractility (Chaban et al., 2021) and is associated in epidemiological data with arrhythmia prevalence. Patients with AFib, pacemakers, or ICDs who report symptom worsening that correlates with time at home warrant a low threshold for environmental investigation.
The most clinically meaningful interventions are diagnostic documentation and validation. Patients in this situation have typically been dismissed, misdiagnosed, or treated for psychiatric conditions that do not address the underlying exposure. A physician who takes the symptom report seriously, orders appropriate workup, and documents environmental correlation in the chart provides three things:
Specific treatment of the underlying exposure is environmental, not pharmacological. Symptomatic management (sleep, anxiety, cardiac symptoms) follows standard protocols.
The peer-reviewed evidence base on residential infrasound and low-frequency noise is small but growing rapidly. Key references:
A consolidated reference library is available on the main site →
The following clinical references are available for use in practice:
Single-page printable card. Symptom cluster, differentiating clinical questions, recommended workup, and key peer-reviewed citations. For use in clinic, with colleagues, or as a discussion starter with patients. PDF.
Download PDF →Two-column printable glossary covering acoustic, physiological, measurement, community, and tactical terminology. For use in clinical or legal consultations. 1 page.
Download PDF →If you have a patient who would benefit from peer-reviewed literature, structured symptom logging tools, or guidance on environmental documentation, the main site at lfresearch.org provides patient-facing resources. The site is non-commercial, non-affiliated, and does not provide medical advice.
Structured symptom logging, evidence export, and documentation tools for low-frequency noise cases.