Salt treatment, most commonly called halotherapy, is a practice where you breathe in tiny particles of pharmaceutical-grade salt inside a controlled room or chamber. A machine called a halogenerator grinds pure sodium chloride into microscopic particles and disperses them into the air, creating a dry salt aerosol you inhale over the course of a session. The practice has roots in 19th-century Eastern European salt mines, where workers showed unusually good respiratory health, and has since moved into purpose-built “salt rooms” at spas and wellness centers worldwide.
How Salt Treatment Works
The core idea is simple: salt particles small enough to reach deep into your airways act on mucus, bacteria, and inflammation. When you inhale the aerosolized salt, the particles travel through the nose and throat and into the lower lungs. Once there, the salt draws moisture from surrounding tissues, which reduces swelling in the airway walls. It also attaches to mucus, thinning it and making it easier to cough up. Salt’s natural antibacterial and anti-inflammatory properties contribute to the effect. On a deeper level, inhaled salt particles have been shown to improve mucociliary transport, the wave-like motion of tiny hairs in your airways that sweep debris and mucus upward and out of the lungs.
A pulmonary physician with 50 years of practice, Anthony J. Cuomo, MD, has compared the mechanism to a procedure he routinely performs in clinical settings: rinsing airways with saline solution during bronchoscopy. “The salt solution reduces the viscosity of sputum, liquefying it and making it easier to expel,” he explains. “Inhaling a dry salt mist from a halogenerator also liquefies mucus, reducing its viscosity, and is just as effective.”
Dry Salt vs. Wet Salt Treatments
Not all salt treatments are the same, and the distinction between “dry” and “wet” matters. Dry halotherapy is what most people picture: sitting in a salt-lined room while a halogenerator fills the air with invisible salt microparticles. You breathe normally, sometimes using a slow exhale pattern to keep the lungs open longer on each breath.
Wet salt treatments use salt dissolved in water. This category includes saline nebulizers (commonly prescribed for respiratory conditions), neti pots for nasal rinsing, gargling with salt water, and salt baths for the skin. Wet salt has been a standard medical tool for decades. Sodium chloride is a key ingredient in nebulizers, steroid inhalers, IV lines, and eye-washing solutions. Dry halotherapy is the newer concept and the one still building its evidence base, particularly in the United States.
What a Session Looks Like
A typical salt room session lasts 30 to 45 minutes. You sit or recline in a room designed to feel calm, often with salt-covered walls and dim lighting, while the halogenerator runs quietly. You don’t need to do anything special beyond breathing normally. The salt concentration in the air is low enough that most people don’t taste or feel it.
For respiratory conditions, the general recommendation is 45-minute sessions two to three times per week over a course of four to eight weeks. People with chronic conditions like asthma or persistent bronchitis may follow a longer timeline of 6 to 12 weeks to establish a baseline of improvement. Single sessions are also offered at many facilities for general wellness or stress relief, though meaningful respiratory effects typically require repeated visits.
Respiratory Effects
Most of the research on salt treatment focuses on respiratory conditions: asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). In a clinical survey of patients with chronic allergic and inflammatory respiratory conditions, two-thirds of those with bronchial asthma, chronic bronchitis, or obstructive lung disease showed a significant reduction in irritative dry cough after 10 days of halotherapy sessions. By 12 to 15 sessions, dry cough and wheezing were largely absent in the treatment group. About one-quarter of patients were able to reduce their regular medications (antihistamines, bronchodilator drugs, corticosteroid inhalers) by 20 to 30 percent after completing treatment.
Inhaled salt solutions have also been tested in more rigorous settings. A double-blind, randomized trial of 340 adults experiencing acute asthma attacks found that combining a 3% saline solution with a standard bronchodilator produced significantly better lung function at 40 and 60 minutes compared to the bronchodilator alone. Salt inhalation also boosted mucus clearance rates dramatically in the short term: average clearance jumped from about 9% at baseline to over 23% in a 60-minute window after treatment. That said, the enhanced clearance did not hold beyond four hours, which helps explain why repeated sessions are recommended rather than one-time visits.
Skin Conditions
Salt treatment isn’t limited to the lungs. Salt baths, in particular, have a long history of use for skin conditions like psoriasis and eczema. The mineral content in salt water appears to reduce inflammation and may help soften the thick, scaly plaques characteristic of chronic psoriasis. A Cochrane review found that salt baths combined with ultraviolet B light therapy improved psoriasis outcomes compared to UV light alone, with no increase in side effects serious enough to stop treatment. Dry halotherapy, where salt particles settle on exposed skin during a session, is also marketed for skin conditions, though the evidence is thinner than for salt baths.
Where the Practice Comes From
The idea behind salt treatment traces back to Polish salt mines in the 1800s. While most mining occupations were known to destroy workers’ health, salt miners were a striking exception. They rarely developed respiratory problems and their skin appeared notably healthy. A physician named Feliks Boczkowski studied this phenomenon, and in 1839 he opened the first health resort at the Wieliczka Salt Mine in Poland. He offered salt baths using natural underground brine and noted in his writing that spending time underground in the salt mine could be even more effective for asthma than salt inhalations alone. This practice became known as speleotherapy (therapy inside natural salt caves), and it remained popular across Eastern Europe throughout the 20th century. Modern halotherapy recreates those underground conditions artificially using halogenerators.
Risks and Limitations
Salt treatment is generally well tolerated, but it isn’t risk-free. Some people experience throat irritation, increased coughing, or mild headaches during or after a session. For people with asthma, the salt aerosol can occasionally constrict or irritate the airways, temporarily worsening wheezing and shortness of breath. This is somewhat paradoxical given that halotherapy is often marketed to asthma sufferers, so starting cautiously and paying attention to how your body responds is important.
The broader limitation is the quality of available evidence. While individual studies show promising results, much of the research involves small sample sizes or lacks rigorous controls like true placebo groups (it’s difficult to create a convincing fake salt room). The clinical improvements that do show up, like mucus clearance, tend to be short-lived without ongoing sessions. Salt treatment is best understood as a complementary approach, one that may support respiratory and skin health alongside conventional treatment, rather than a standalone cure for any condition.