Patients are frequently surprised that heat therapy appears in a treatment plan from an interventional pain practice. It sounds like a comfort measure — the sort of advice given when nothing else is left.
It is in the plan for specific physiological reasons. Some of those reasons are well supported, some are plausible but unproven, and a few are frankly speculative. Below, they are separated, 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, which have reported associations between frequent sauna bathing and lower cardiovascular and all-cause mortality. These are observational findings — people who sauna frequently differ from people who do not — but the cohorts are large and the relationship has been consistent.
Heat shock proteins and the hormetic response. Sustained heat exposure, on the order of twenty minutes and upward, produces mild physiological stress and induces heat shock proteins. This is hormesis: a small stressor provoking an adaptive response that leaves the system more resilient. It is the same principle that makes exercise beneficial rather than damaging.
Growth hormone release. Heat exposure of sufficient intensity and duration provokes growth hormone secretion. For chronic pain patients this matters more than it might sound, because the group is disproportionately affected by sarcopenia — muscle loss driven by immobility, which is itself driven by pain on movement. Anything that supports muscle maintenance in a patient who cannot easily exercise is clinically useful.
Fluid and sodium. Patients in chronic pain frequently carry elevated cortisol, and elevated cortisol promotes sodium retention and the swelling that comes with it. Sweating shifts sodium and fluid, and blood pressure often responds.
Plausible, still under investigation
Insulin sensitivity. There is a described relationship between heat exposure and improved insulin sensitivity. Mechanistically it fits with what heat does to the vasculature and to heat shock protein expression, and it matters here because insulin resistance is a substrate for pain — see why we treat insulin before we treat the joint. The human evidence is early.
Non-alcoholic fatty liver disease. A large proportion of the patients we see have significant fatty liver. The first-line answer is dietary — reducing the carbohydrate load that drives hepatic fat storage. Whether raising metabolic rate through heat meaningfully mobilises that fat is a reasonable hypothesis rather than a demonstrated one. See treating metabolic disease at the dietary root cause.
Mitochondrial melatonin. There is an interesting line of work on melatonin produced within mitochondria acting as a local free-radical scavenger, and on infrared exposure influencing it. This is early-stage research. We mention it because it is part of the rationale, not because it is settled.
Dopamine and symptom relief. Heat exposure produces dopamine release, which is part of why a sauna session feels good and why pain is more tolerable afterward. That is real, and it is also the least durable of the effects.
Weak or speculative — and we will say so
“Detoxification” of volatile organic compounds. The claim is that sweating mobilises fat-soluble environmental compounds. Some compounds are detectable in sweat, but whether sauna use meaningfully reduces total body burden, and whether that translates into any clinical benefit for pain, is not established. Treat this as speculative.
Osteoarthritis, migraine and sinus symptoms. Patients report benefit — better joint function through maintained muscle and mobility, easier sinus drainage through changed mucus viscosity. These are plausible and largely anecdotal. Individual results vary.
Infrared versus traditional sauna
Both are used. The variable that matters is not the technology but the dose — core temperature reached, duration, and how much you actually sweat. Infrared achieves that at a lower ambient air temperature, which some patients tolerate better; a traditional sauna gets there faster and hotter.
Frequency in the Finnish cohort data clusters around four to seven sessions a week for the strongest associations. That is a substantial commitment, and it is the honest number rather than a comfortable one.
One piece of practical information rather than caution: in the Finnish data, sauna-related deaths are overwhelmingly associated with alcohol. Heat drops blood pressure and alcohol blunts the 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 cardiovascular benefits, and that is genuinely useful for patients whose pain limits activity — but it is a complement, not a replacement. Where movement is possible, movement is better. See why we treat insulin before we treat the joint.
How long and how often?
Twenty minutes or more per session is where the heat shock protein and growth hormone responses appear, and the population data associates the strongest benefit with roughly four to seven sessions weekly. Build up gradually.
Does it really detoxify anything?
That is the weakest claim in this article and we are not going to overstate it. Some compounds appear in sweat; whether it changes total body burden or helps pain is unproven.
Infrared or traditional?
Either. What matters is how hot you get and for how long, not which technology delivers it. Infrared is often easier to tolerate at 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
- Cardiovascular benefit has the strongest support, from large observational Finnish cohorts.
- Heat shock proteins, growth hormone and the hormetic response are the mechanistic core.
- Insulin sensitivity and fatty liver effects are plausible but early.
- “Detoxification” of environmental compounds is speculative and labelled as such.
- Dose — temperature, duration, frequency — matters more than infrared versus traditional.
- Heat and alcohol do not mix — that combination accounts for most sauna-related deaths.
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.
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.
Book an appointment or call (314) 481-5000 · text (314) 886-5902
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.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
