Heat on a sore back is one of the oldest home remedies there is. A sauna is that idea scaled up to the whole body.
Two small studies have tested it, one for low back pain and one for tension headaches. This article reports both. It sits under our overview of sauna health benefits. This is general information, not medical advice. Ongoing pain needs a diagnosis, not a sauna.
Short answer: small studies suggest regular sauna use can reduce low back pain and the intensity of tension-type headaches. Each study had 37 people, and the back pain one had no control group. Treat a sauna as a comfort that may help, not a treatment.
Back pain: the 2019 study
A 2019 study enrolled 37 patients with low back pain. Each had dry sauna therapy at 90°C for 15 minutes, 10 sessions over one week.
Pain scores “were significantly reduced after dry sauna therapy.” On a 0-to-10 pain scale, the median went from 5 before to 3 after. A disability score also improved, from a median of 12 to 8.
Seventy percent of participants rated the treatment a success, and “no adverse effects were observed.”
The authors’ conclusion is careful: dry sauna therapy “may be useful to improve quality of life and reduce pain in patients with low back pain.”
What that study can’t show
There was no comparison group. Everyone got the sauna, and everyone knew it.
Back pain often improves over a week on its own, and people who expect a treatment to help tend to report that it did. Without a control group, you can’t separate the sauna from those effects. Ten sessions in one week is also more than most people would do at home.
Headaches: the 2015 trial
This one was randomized, which makes it stronger. Researchers assigned 37 people with chronic tension-type headache to regular sauna bathing or to a control group.
Headache intensity improved more in the sauna group, by 1.27 points, a statistically significant difference.
The limits are in the same abstract: “There was no statistically significant change in duration of headache or improvement in sleep, depression” or the disability score.
So the headaches hurt less. They didn’t get shorter, and the other measures didn’t move. The authors still called sauna bathing “a simple, self-directed treatment that is effective for reducing headache pain intensity.”
Note what the trial covered: chronic tension-type headache. It didn’t test migraine.
The two studies side by side
| Back pain (Cho et al., 2019) | Headache (Kanji et al., 2015) | |
|---|---|---|
| People | 37 | 37 |
| Design | No control group | Randomized, with control group |
| Sauna | 90°C, 15 minutes, 10 sessions in a week | Regular sauna bathing |
| Main result | Median pain 5 to 3 | Intensity down 1.27 points vs control |
| What didn’t change | Not reported | Duration, sleep, depression |
A wider review from 2006 says something similar in one line: “In musculoskeletal disorders, baths may relieve pain.” It also asked for better-designed research.
When a sauna can make a headache worse
A sauna dehydrates you, and dehydration is a common headache trigger. That link is general knowledge, not a quote from these studies. The fix is the standard advice from every source: water before and after, and no alcohol.
If heat tends to set off your headaches, a sauna may not be for you. Start with a short session and see.
When to see a doctor instead
Don’t sauna your way around these:
- Back pain with numbness, weakness, or loss of bladder or bowel control
- Back pain after a fall or injury
- A sudden, severe headache, or the worst headache of your life
- Headaches that are new, changing, or come with fever or confusion
That list is basic safety advice from me, not from the studies. If any of it fits, get medical care.
If you are buying for this
The back pain study used a hot, dry sauna at 90°C, which is 194°F. That is traditional-heater territory. The Finnmark FD-4 Trinity ($7,795) lists a 190°F maximum on its traditional stove. The Almost Heaven Salem ($4,176) has a 6kW heater and needs a 240V, 30-amp circuit.
My rule of thumb: try a sauna at a gym for a few weeks before you spend thousands on the theory that it will fix your back. The home sauna buying guide covers the rest.
Cleveland Clinic says people with heart or blood pressure conditions should check with a provider before using a sauna.
Bottom line: two small studies point the same way: less pain, for back pain and for tension headaches. Neither is strong enough to call a sauna a treatment. Use it for comfort, and take persistent pain to a doctor.
Sources
- Cho EH, Kim NH, Kim HC, Yang YH, Kim J, Hwang B, “Dry sauna therapy is beneficial for patients with low back pain,” Anesthesia and Pain Medicine, 2019 (abstract): pubmed.ncbi.nlm.nih.gov
- Kanji G, Weatherall M, Peter R, Purdie G, Page R, “Efficacy of regular sauna bathing for chronic tension-type headache: a randomized controlled study,” Journal of Alternative and Complementary Medicine, 2015 (abstract): pubmed.ncbi.nlm.nih.gov
- Kukkonen-Harjula K, Kauppinen K, “Health effects and risks of sauna bathing,” International Journal of Circumpolar Health, 2006 (abstract): pubmed.ncbi.nlm.nih.gov
- Cleveland Clinic, “Get Your Sweat On: The Benefits of a Sauna,” August 12, 2024: health.clevelandclinic.org
- Finnmark and Almost Heaven listings (maximum temperature, heater, power, price), checked September and October 2026