Can a Sauna Help with Back Pain?

A sauna may make back pain feel better, but the evidence that sauna bathing actually treats back pain is limited.

Small studies have found reductions in pain and stiffness following sauna use, while research into heat therapy more generally suggests that warmth can provide short-term relief for some types of low back pain.

But that isn't the same as treating the underlying cause.

So if you're considering a sauna for back pain, the sensible conclusion is:

A sauna may be useful for comfort and relaxation, but it shouldn't be considered a proven treatment for back pain.

What does the research say?

There isn't a large body of research specifically looking at saunas and back pain.

One 2019 study looked at 37 people with chronic low back pain. Participants completed ten 15-minute sessions in a dry sauna at approximately 90°C over five days.

After the sessions, median pain scores fell from 5/10 to 3/10, while scores measuring disability also improved. Around two-thirds of participants experienced at least a 30% reduction in pain.

Those results are encouraging, but there is an important limitation:

There was no control group.

That means the study cannot establish that the sauna caused the improvement. Chronic back pain can fluctuate naturally, and other factors may have contributed.

The study therefore provides an interesting signal, rather than strong evidence that sauna therapy treats chronic back pain.

What about stiffness and inflammatory back pain?

Another small study looked at people with ankylosing spondylitis and rheumatoid arthritis using an infrared sauna.

Participants used the sauna at approximately 55°C for 30 minutes, twice a week for four weeks.

People with ankylosing spondylitis experienced substantial reductions in pain and stiffness during the sauna sessions. However, the longer-term improvements over the four weeks were not statistically significant.

Again, this suggests that heat may provide temporary relief, rather than demonstrating that sauna use changes the underlying condition.

And the study was small and uncontrolled.

Is there better evidence for heat itself?

Yes.

The evidence for heat therapy generally is considerably stronger than the evidence for saunas specifically.

Research into heat wraps and other forms of superficial heat has found short-term reductions in pain in some people with acute or sub-acute low back pain.

That gives us a reasonable basis for thinking that warmth can be useful for symptom relief.

But it doesn't allow us to leap from:

"Heat can help back pain"

to:

"Saunas treat back pain."

A heat wrap applies warmth directly to a particular area. A sauna heats the whole body. They are different interventions.

That's why the sauna-specific evidence still matters.

What does UK guidance say?

NICE guidance for low back pain and sciatica emphasises staying active and exercising, rather than passive treatments.

The NHS similarly recommends keeping active and notes that heat packs can help with stiffness or muscle spasms.

Sauna bathing isn't recommended as a treatment for back pain.

That doesn't mean a sauna can't be useful.

It means there isn't currently enough evidence for sauna therapy to be considered part of the standard treatment approach.

If you find that heat makes your back feel more comfortable, a sauna could be something you use alongside an active approach — rather than instead of one.

Could a sauna make movement easier?

Possibly, but this is where we need to distinguish evidence from reasonable inference.

If you feel less stiff after warming up, you may find movement more comfortable.

That could make a sauna a useful part of a routine that includes walking, exercise or other appropriate treatment.

But there isn't good evidence showing that sauna use itself improves long-term back function.

Feeling better and getting better aren't necessarily the same thing.

What sauna temperature is best for back pain?

There isn't enough evidence to answer that.

The dry-sauna study used approximately 90°C, while the infrared study used approximately 55°C.

Those temperatures describe what the researchers used. They aren't established therapeutic temperatures for back pain.

We don't currently have good evidence showing that one sauna temperature, sauna type or session length is superior for treating back pain.

So if you're choosing a sauna, I wouldn't choose it based on a claim that a particular temperature will fix your back.

Choose the sauna that suits how you actually want to use it.

When should you get medical advice?

A sauna shouldn't be used as a substitute for medical assessment when back pain could indicate something more serious.

Seek urgent medical help if back pain is accompanied by symptoms such as:

• numbness or tingling around the genitals or buttocks;
• difficulty passing urine;
• loss of bladder or bowel control;
• weakness or numbness in both legs;
• chest pain;
• or feeling feverish or seriously unwell.

You should also speak to a GP if your back pain isn't improving, is getting worse, is particularly bad at night, or is accompanied by unexplained weight loss or a lump or swelling.

And if you have a medical condition, are pregnant, or have been advised to avoid significant heat exposure, get appropriate medical advice before using a sauna regularly.

So, can a sauna help with back pain?

It might. But the evidence is not strong enough to call it a treatment.

Small studies have found improvements in pain, stiffness and disability following sauna use, but the research is limited and lacks the controlled trials we'd want before drawing strong conclusions.

There is better evidence that heat therapy can provide short-term relief for some forms of back pain.

For Tarnfell, that's the useful distinction.

If you already want a sauna and find that warmth helps you feel less stiff, more comfortable or more relaxed, back comfort is a reasonable additional benefit to consider.

If you're thinking about spending thousands of pounds on a sauna specifically because you believe it will treat your back pain, the current evidence doesn't justify that conclusion.

A sauna may help you feel better. We don't yet have good evidence that it makes the underlying back problem better.