Salt therapy
Mountain air
Respiratory conditions
Speleotherapy in underground salt mines, pure mountain air and salty aerosols.
By the Terra Cura editorial team · Last updated: August 2026
Health notice
This article offers editorial health and travel information and is no substitute for medical advice, diagnosis or treatment. Asthma and chronic lung disease must be managed by a doctor — never change or stop your medication for a cure, and always keep your reliever inhaler with you.
What is it?
Chronic respiratory complaints, stable bronchial asthma and recurring infections of the upper and lower airways make everyday breathing harder. Low-irritant, clean air can bring relief.
Romania is exceptionally rich in salt deposits, and its underground salt mines hold a remarkably stable microclimate: a constant temperature of roughly 12–16 °C, moderate humidity of around 50–80%, very little dust, pollen or airborne germs, and a fine salt aerosol suspended in the air. This clean, even, low-allergen environment has been used for respiratory cures — speleotherapy — for decades.
How Romania's spas help
Traditionally recommended are:
- Speleotherapy — extended stays in underground salt mines
- Salty aerosols — fine salt particles in the air you breathe
- Low-germ, even microclimate — low-irritant and consistently tempered
- Pure mountain air — at many salt sites in higher altitudes
Well-known Romanian salt mines for speleotherapy include Praid, Turda, Slănic Prahova and Târgu Ocna. Learn more about the remedy salt on our page Remedy: Salt.
How the natural remedy is thought to work
Speleotherapy is thought to act through several factors at once. The fine sodium-chloride aerosol that guests breathe deep underground may help thin bronchial mucus and support the airways' own cleaning mechanism (the mucociliary escalator), making it easier to clear congestion. At the same time, the air is naturally poor in pollen, dust and germs, giving over-reactive airways a genuine rest from the everyday triggers that provoke inflammation and wheeze. The constant cool temperature, high mineral content and calm, quiet setting round out the effect. These mechanisms are plausible and long reported by patients — but, as below, they are not yet confirmed by high-quality trials.
What does the evidence say?
The evidence base is genuinely thin, and it is fair to say so. A Cochrane systematic review of speleotherapy for asthma could identify only a handful of small studies of modest quality — none of them robust randomised controlled trials — and therefore could not draw a reliable conclusion about whether speleotherapy works. Broader reviews of halotherapy and salt-mine treatment reach a similar verdict: many people describe subjective relief and easier breathing, but rigorous proof of a lasting effect is still lacking, and larger, well-designed trials are needed.
Our honest position: a salt-mine stay is a pleasant, low-risk, complementary measure that some people find genuinely soothing for chronic airway complaints — but it is not a proven treatment and must never replace prescribed asthma or COPD medication. Keep your inhaler with you and have a doctor confirm a stay is appropriate.
Sources
- Beamon SP et al. Speleotherapy for asthma. Cochrane Database of Systematic Reviews. cochrane.org
- Speleotherapy – modern bio-medical perspectives. PMC, National Library of Medicine. ncbi.nlm.nih.gov
- Halotherapy / Salt Therapy — evidence overview. Global Wellness Institute. globalwellnessinstitute.org
Recommended treatments
The salt mines of Praid, Turda, Slănic Prahova and Târgu Ocna are well-known speleotherapy sites.
| Salt mine / resort | Main remedy | Recommended cure length | Season |
|---|---|---|---|
| Praid | Speleotherapy in a large underground salt gallery | 2–3 weeks | Year-round |
| Târgu Ocna | Dedicated underground speleotherapy sanatorium | 2–3 weeks | Year-round |
| Slănic Prahova | Speleotherapy in vast salt chambers | 2–3 weeks | Year-round |
| Turda | Salt-mine microclimate & salt aerosol | 1–2 weeks | Year-round |
| Cacica | Historic salt mine, salt aerosol | 1–2 weeks | Year-round |
| Ocna Șugatag | Salt springs, mountain air, salt-mine climate | 2–3 weeks | Year-round |
Good to know before you go
Typical cure duration
A typical medical course involves daily sessions of one to several hours underground over about two to three weeks; some mines also offer shorter wellness visits. Dedicated speleotherapy centres such as Târgu Ocna run longer, structured programmes.
Contraindications
Speleotherapy is not suitable during acute respiratory infections, with unstable or severe asthma, with active tuberculosis, with severe heart or lung failure, or where claustrophobia makes an enclosed underground space distressing. The cool underground air can also provoke cold-sensitive asthma in some people. Have a doctor assess suitability, especially for asthma, before you travel.
What to bring
- Warm layers and a light jacket — it stays cool underground all year
- Closed, comfortable shoes for uneven salt floors
- Your inhaler or reliever medication, plus drinking water
- A list of your medications and relevant records for the spa doctor
FAQ
What is speleotherapy?
In speleotherapy, spa guests spend extended periods in underground salt mines. The low-germ, evenly tempered air is rich in salty aerosols and is traditionally used for chronic respiratory complaints.
Is salt therapy suitable for asthma?
It is traditionally recommended for stable bronchial asthma and recurring infections. In case of acute complaints or unstable asthma, whether a stay is suitable should be assessed by a doctor beforehand.
What is the microclimate like inside a Romanian salt mine?
Deep salt mines hold a remarkably stable microclimate: a constant temperature of roughly 12 to 16 degrees Celsius, moderate humidity of about 50 to 80 percent, very little dust, pollen or airborne germs, and a fine salt aerosol in the air. This clean, low-irritant, even environment is the basis of speleotherapy.
How is the natural remedy thought to work on the airways?
The proposed mechanism combines several factors. The fine sodium-chloride aerosol may help thin mucus and support the airways' natural clearance, while the pollen-, dust- and germ-poor air gives sensitive airways a rest from everyday triggers. The stable temperature and calm setting add to the effect. These mechanisms are plausible and traditionally reported, but not conclusively proven by high-quality trials.
What does the scientific evidence say about speleotherapy?
A Cochrane review of speleotherapy for asthma found the evidence very limited: only a few small trials of modest quality, none of them robust randomised controlled trials, so it could not draw a reliable conclusion about effectiveness. Many people report subjective relief, but firm proof is lacking and more research is needed. See speleotherapy as a supportive, complementary measure alongside your prescribed treatment.
How long does a salt-mine cure last?
Programmes vary by site, but a typical course involves daily sessions of one to several hours underground over about two to three weeks. Some mines offer shorter wellness visits, while medical speleotherapy centres run longer, structured courses.
When is salt therapy not advisable?
It is not suitable during acute respiratory infections, unstable or severe asthma, active tuberculosis, severe heart or lung failure, or claustrophobia that makes an enclosed underground space distressing. The cool underground air can also trigger cold-sensitive asthma in some people. Always have a doctor assess suitability, especially for asthma.
What should I bring for a salt-mine cure?
Warm layers and a light jacket, since it stays cool underground, closed comfortable shoes, any inhalers or reliever medication you normally use, drinking water, and a list of your medications with relevant records for the spa doctor.
Find the right resort
Discover Romania's salt sites and spas and let us show you the right treatments for your airways.
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