Halotherapy Explained: Benefits, Limits and What to Expect

Discover what halotherapy is, its potential benefits and limits, plus what to expect during a salt therapy session. 

Salt rooms have moved from Eastern European spa towns to high streets and wellness centres across Britain and Ireland. The idea is simple enough: you sit in a room lined with salt while a machine disperses a fine dry salt aerosol into the air, and you breathe. Enthusiasts swear by it for everything from a blocked nose to a bad night’s sleep. Sceptics point out that the clinical evidence is thin. Both have a point.

This guide sets out what halotherapy actually is, what the research does and does not support, who should avoid it, and what to expect if you book a session out of curiosity.

In short: halotherapy is a relaxing, low-risk wellness treatment that many people find helps them breathe and unwind. It is not a medical treatment and should never replace prescribed medication.

Where it came from

The story usually starts in the 1840s at the Wieliczka salt mine in Poland, where a physician noted that miners seemed to suffer fewer respiratory complaints than the general population. Underground salt sanatoria followed across Eastern Europe. Modern halotherapy recreates those conditions above ground using a halogenerator, a machine that grinds pharmaceutical-grade salt into microscopic particles and blows them into a sealed room.

The main types of salt therapy

• Dry salt room (halotherapy): a halogenerator disperses dry salt aerosol while you sit or recline. Typically 30 to 45 minutes, fully clothed.
• Salt cave or grotto: walls and floor lined with salt blocks or crystals, often with a halogenerator as well. Typically 45 to 60 minutes in low lighting and quiet.
• Saltwater flotation or pool: floating in warm water with a very high salt concentration. Typically 30 to 60 minutes, in swimwear.
• Children’s salt room: a play space with salt underfoot and a gentler aerosol level. Typically 20 to 30 minutes with a parent.

Only the first two are halotherapy in the strict sense. A room decorated with salt lamps and no halogenerator is pleasant, but the air contains very little salt.

What the evidence says, honestly

• Helps you relax and sleep better: plausible and widely reported. A quiet, dim, phone-free room for 45 minutes would do that with or without salt.
• Eases congestion and loosens mucus: some support. Inhaled saline is an established treatment in hospital settings; dry salt aerosol is milder and less studied.
• Improves symptoms of asthma or COPD: limited and mixed. Small studies show short-term improvement for some people; reviews conclude the evidence is not strong enough to recommend it as treatment.
• Improves eczema or psoriasis: anecdotal. Some users report benefit; robust trials are lacking.
• Cures or treats any disease: not supported. Be wary of any provider that says so.

Charities such as Asthma + Lung UK take a cautious line: salt therapy is unlikely to harm most people, it should be treated as complementary, and nobody should stop or reduce prescribed medication because of it. That is the right frame. A reputable centre will tell you the same thing.

What a session actually feels like

1. Arrival. You are usually given shoe covers or asked to go in socks. Phones stay outside or on silent.
2. The room. Warm, dim, quiet, with reclining chairs. The air tastes faintly of salt after a few minutes.
3. During. Most people read, doze or simply sit. You breathe normally; there is nothing to do.
4. Afterwards. A slightly salty taste on the lips and, for some, a runny nose or a light cough for an hour or so as the airways clear. Drink water.
5. Clothing. A fine dusting of salt may settle on dark clothes. It brushes off.

Purpose-built centres tend to offer a better experience than a single converted treatment room, because the rooms are sealed, the halogenerator is properly calibrated and sessions run to a timetable. If you are in Ireland, the long-established salt cave in Dublin, at Balbriggan, combines salt rooms with saltwater flotation pools and gives a fair picture of what a dedicated facility looks like.

Who should check with a doctor first

• Anyone with severe or unstable asthma. Salt aerosol can occasionally trigger coughing or tightness.
• People with active chest infections or a fever.
• Those with serious heart conditions or uncontrolled high blood pressure.
• Anyone undergoing cancer treatment.
• Pregnant women, as a routine precaution.

For healthy adults and children, reported side effects are mild and short-lived.

How to choose a good salt room

• Ask whether there is a halogenerator, and what grade of salt is used. Pharmaceutical-grade sodium chloride is the standard.
• Look for honest language. “Many clients find it helps” is fine. “Treats asthma” is not.
• Check cleaning and ventilation between sessions. Rooms should be aired and surfaces wiped.
• Read recent reviews for comments on cleanliness, punctuality and whether sessions feel rushed.
• Start with a single session before buying a block.

Frequently asked questions

How often do people go? For general relaxation, once every week or two. Those using it for congestion often do a short course of several sessions close together, then top up.

Is it safe for children? Generally yes, and many centres run dedicated children’s sessions. Check with your GP first if your child has a diagnosed respiratory condition.

Is a salt lamp at home the same thing? No. A lamp releases no meaningful amount of salt into the air.

What should I wear? Comfortable clothes you do not mind getting a little dusty. Swimwear if you are also booking a flotation pool.

Treat halotherapy as what it is: an hour of enforced calm in clean, salty air, with some respiratory comfort as a likely bonus. On those terms, most people come out glad they went.