Indoor Hot Tub Use Linked to Chronic Lung Infection
A new case report details how hot tub mist can lead to bacterial lung disease in regular users.
Updated on Sept. 22, 2026 in Asthma
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A 66-year-old woman developed chronic lung disease from Mycobacterium avium complex, which was traced back to her daily use of an indoor hot tub. The patient's condition significantly improved only after she discontinued use of the tub and began specific antimycobacterial treatment.
Why it matters
This case highlights the risk of persistent lung inflammation when the source of bacterial exposure is not identified, complicating diagnosis and treatment. It underscores the importance of considering environmental factors in patients presenting with symptoms of hypersensitivity pneumonitis.
A case report published in Respirology Case Reports describes a patient who required antimycobacterial treatment to resolve lung granulomas. This aligns with findings from a Mayo Clinic series of 21 patients and a separate imaging study of 12 patients involving similar bacterial exposure.
The players
Mayo Clinic
A nonprofit academic medical center that conducted foundational research on the link between hot tub usage and pulmonary infections.
The details
The infection occurs when bacteria in warm, contaminated water are aerosolized by high-pressure jets in enclosed spaces, allowing the pathogen to be inhaled deep into the lungs. Because chlorine loses its disinfecting capability in water warmer than 84 degrees Fahrenheit, hot tubs create an ideal environment for bacterial colonization. Incorrectly diagnosing the resulting lung inflammation as hypersensitivity pneumonitis often leads to ineffective treatment protocols.
Timeline
2002: Mayo Clinic researchers reported two initial hot tub lung cases.
2006: Mayo Clinic series authors concluded antimycobacterial drugs were often unnecessary.
2007: Environmental Health Perspectives published a comprehensive hot tub lung review.
September 15, 2026: The case report was published in Respirology Case Reports.
Health Landscape
This case sits within an established body of research regarding non-tuberculous mycobacterial infections caused by environmental aerosolization. It highlights how clinical practice has evolved to better distinguish between hypersensitivity pneumonitis and infections requiring specific antimycobacterial therapy.
If you use an indoor hot tub and experience persistent respiratory symptoms, it is worth discussing your environmental exposures with your doctor to rule out mycobacterial infection. Clinicians should be alerted to hot tub usage when evaluating patients with chronic, unexplained lung inflammation.
The takeaway
Chronic lung inflammation can be triggered by inhaling bacteria from poorly disinfected, heated water in enclosed spaces. If you notice persistent respiratory issues, specifically mention your hot tub usage to your physician to ensure an accurate diagnosis and appropriate treatment plan.
Further reading
Learn more about managing lung health and respiratory triggers in the Asthma section.
Source note: This article includes information reported by Medical Daily.
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