Heat therapy is in an interventional pain plan for body-chemistry reasons, not comfort. Long sauna sessions trigger heat shock proteins. They spur growth hormone release, which helps protect muscle. And they shed the sodium and fluid that high cortisol holds on to. Other benefits are plausible but unproven, and a few are guesswork.
Patients are often surprised to see heat therapy in a plan from an interventional pain practice. It sounds like a comfort measure — the kind of advice you get when nothing else is left.
It is in the plan for specific body-chemistry reasons. Some of those reasons are well supported. Some are plausible but unproven. A few are frankly guesswork. Below, we sort them out, because a patient deciding how much effort to put into this deserves to know which is which.
Reasonably well supported
Cardiovascular association. The strongest evidence for regular sauna use comes from long-running Finnish population cohorts. They have reported links between frequent sauna bathing and lower rates of death from heart and blood vessel disease and from all causes. These are observational findings — people who sauna often differ from people who do not. But the cohorts are large, and the link has held up.
Heat shock proteins and the hormetic response. Steady heat exposure, about twenty minutes and up, puts mild stress on the body and triggers heat shock proteins. This is hormesis: a small stress that makes the body adapt and come back tougher. It is the same reason exercise helps rather than harms.
Growth hormone release. Heat that is hot enough and long enough triggers growth hormone release. For chronic pain patients this matters more than it might sound, because this group is hit hard by sarcopenia — muscle loss from not moving, which itself comes from pain on movement. Anything that helps keep muscle in a patient who cannot easily exercise is useful in the clinic.
Fluid and sodium. Patients in chronic pain often carry high cortisol. High cortisol makes the body hold sodium and the swelling that comes with it. Sweating sheds sodium and fluid, and blood pressure often responds.
Plausible, still under investigation
Insulin sensitivity. Heat exposure has been linked to better insulin sensitivity. The mechanism fits with what heat does to blood vessels and to heat shock proteins. It matters here because insulin resistance is a soil that pain grows in — see why we treat insulin before we treat the joint. The human evidence is early.
Non-alcoholic fatty liver disease. Many of the patients we see have significant fatty liver. The first-line answer is diet — cutting the carbohydrate load that drives fat storage in the liver. Can raising your metabolic rate with heat really burn off that fat? That is a fair idea, but it has not been proven. See treating metabolic disease at the dietary root cause.
Mitochondrial melatonin. There is an interesting line of work on melatonin made inside mitochondria. It may act as a local cleaner of free radicals, and infrared exposure may affect it. This is early-stage research. We mention it because it is part of our reasoning, not because it is settled.
Dopamine and symptom relief. Heat exposure releases dopamine. That is part of why a sauna session feels good and why pain is easier to bear afterward. That is real. It is also the shortest-lived of the effects.
Weak or speculative — and we will say so
“Detoxification” of volatile organic compounds. The claim is that sweating flushes out environmental chemicals stored in fat. Some of these chemicals do show up in sweat. But no one has shown that sauna use meaningfully cuts the total amount in the body. And no one has shown that it helps pain. Treat this as speculative.
Osteoarthritis, migraine and sinus symptoms. Patients report benefit. They describe better joint function from kept-up muscle and mobility, and easier sinus drainage from thinner mucus. These are plausible and mostly based on patient stories. Individual results vary.
Infrared versus traditional sauna
Both are used. What matters is not the technology but the dose — how hot your core gets, how long you stay, and how much you actually sweat. Infrared gets there at a lower air temperature, which some patients handle better. A traditional sauna gets there faster and hotter.
In the Finnish cohort data, the strongest links show up at about four to seven sessions a week. That is a big commitment. It is the honest number, not a comfortable one.
One practical fact, not a warning: in the Finnish data, sauna-related deaths are overwhelmingly associated with alcohol. Heat drops blood pressure, and alcohol blunts the body’s response to it. The two do not belong together.
Frequently asked questions
Is the sauna a substitute for exercise?
No. Some cohort data shows overlapping heart and blood vessel benefits. That is truly useful for patients whose pain limits activity. But it adds to exercise; it does not replace it. When you can move, moving is better. See why we treat insulin before we treat the joint.
How long and how often?
The heat shock protein and growth hormone responses show up at twenty minutes or more per session. The population data ties the strongest benefit to about four to seven sessions a week. Build up slowly.
Does it really detoxify anything?
That is the weakest claim in this article, and we will not oversell it. Some chemicals show up in sweat. Whether that changes the total amount in the body or helps pain is unproven.
Infrared or traditional?
Either. What matters is how hot you get and for how long, not which machine does it. Infrared is often easier to handle at a lower air temperature.
Where can I be evaluated?
Padda Institute, 4477 Woodson Rd, Suite 100, St. Louis, MO 63134, serving the St. Louis region across Missouri and Illinois. Call (314) 481-5000 or text (314) 886-5902.
Key takeaways
- Heart and blood vessel benefit has the strongest support, from large observational Finnish cohorts.
- Heat shock proteins, growth hormone and the hormetic response (small stress, stronger body) are the core of how it works.
- Effects on insulin sensitivity and fatty liver are plausible but early.
- “Detoxification” of environmental compounds is speculative and labeled as such.
- Dose — heat, time, how often — matters more than infrared versus traditional.
- Heat and alcohol do not mix — that combination accounts for most sauna-related deaths.
This article is educational and is not a substitute for evaluation, diagnosis, or treatment by a physician. Individual results vary. Do not start, stop, or change any medication without consulting your physician.
Find out what is actually driving your pain
Evaluation at the Padda Institute starts by identifying the pain generator and the metabolic terrain it is running on — not by adding another prescription.
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Padda Institute Center for Interventional Pain Management, 4477 Woodson Rd, Suite 100, St. Louis, MO 63134 — serving the St. Louis region across Missouri and Illinois.
Medically reviewed by Gurpreet Singh Padda, MD, MBA, MHP — Board Certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed August 2026.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
