Dopamine Index
Sauna
In plain English
Sitting in a hot sauna is a real physical stress that reliably raises norepinephrine and, in some studies, prolactin and growth hormone. But nobody has measured dopamine in a sauna study. The popular claim that sauna gives a ‘dopamine boost’ is not a finding from sauna research at all — it is an assumption borrowed from what people say about cold showers. Any benefit sauna brings to mood may come through those measured hormones, relaxation or routine, not dopamine, which remains untested.
The evidence
- Evidence
- ?Insufficient
- Human evidence
- No · No sauna study has measured dopamine in blood or brain
- Studies reviewed
- 3
- Verdict
- Explainer — no single claim judged
- How sure are we?
- Very uncertain
- Last reviewed
- Grade status
- Provisional — awaiting editorial validation
Short answer
Sauna bathing reliably raises plasma norepinephrine and, in some studies, prolactin, but none of the published human studies of sauna heat exposure have measured dopamine 12. Claims that sauna use gives a “dopamine boost” are an assumption borrowed from the general idea that heat stress and cold-water immersion both activate the sympathetic nervous system, not a finding from sauna research itself. Evidence currently insufficient to say what, if anything, sauna heat does to dopamine.
- Evidence
- ?Evidence currently insufficient
- Why this grade
- Every identified human sauna study measured norepinephrine, epinephrine, prolactin, growth hormone or cortisol, not dopamine 123. No PET, microdialysis or plasma-dopamine study of sauna bathing in humans was found, so there is nothing to grade the claim against.
- Last reviewed
- 24 September 2026
The quick explanation
Sitting in a hot sauna is a heat stressor, and the body responds the way it responds to most physical stressors: by releasing norepinephrine from the sympathetic nervous system. Several older physiology studies measured this, along with hormones like prolactin, cortisol and growth hormone, in people using saunas. None of them measured dopamine. So the popular idea that sauna use gives a “dopamine hit” is not something sauna research has actually tested — it is borrowed from claims made about other heat and cold exposures.
What it is
A sauna is a small room heated to a high temperature (commonly 80–120°C in the Finnish tradition), used for relaxation, recovery after exercise, or as a regular wellness practice.
Does dopamine play a role?
Sauna use is a well-documented heat and cardiovascular stressor with clearly measured hormonal effects, but no published human study has measured what, if anything, it does to dopamine — so a role for dopamine here is currently unproven rather than supported or ruled out.
Sauna use is often grouped with cold showers and cold-water immersion in “dopamine hack” content, on the assumption that any strong physical stressor works the same way on brain chemistry. The actual physiology research on sauna bathing does not support or contradict that assumption — it simply has never measured dopamine.
Human evidence
Search terms combining sauna, heat exposure and dopamine return studies of temperature, blood pressure, endocrine and cardiovascular responses, but not one dopamine assay. This is a different situation from most of the other entries in this index, where the problem is a small or inconsistent human evidence base; for sauna, the problem is that the specific measurement has simply not been attempted.
Several small physiology studies from the 1970s to 1990s measured hormonal responses to Finnish-style sauna heat exposure. One study of eleven healthy women found intense sauna heat significantly raised plasma norepinephrine (mean increase around 86%) and prolactin (mean increase around 510%), while changes in epinephrine, beta-endorphin, corticotropin and cortisol were variable and not statistically significant compared with a no-heat control session1.
A comparative study of nine winter-swimming men tested combinations of sauna, ice-water immersion, cold showers and room-temperature recovery. Norepinephrine rose significantly after exposure in these combinations, and epinephrine nearly doubled specifically in the sauna-plus-ice-water condition, alongside a modest rise in ACTH and cortisol2. An older study of fifty-five volunteers in a Finnish sauna found a significant rise in growth hormone and plasma renin activity, with no significant change in blood glucose or insulin, and a reduction in urinary sodium excretion after the sauna session3.
The gap in the evidence
Across all three studies, and every other sauna physiology study identified, dopamine itself was never one of the hormones measured. The catecholamine consistently tracked is norepinephrine, sometimes alongside epinephrine; dopamine assays simply do not appear in this literature. This is different from the cold-water immersion research, where at least two studies did measure plasma dopamine directly, with inconsistent results. For sauna, there is no comparable direct measurement to point to at all.
Animal evidence
There is no substantial animal literature measuring brain or plasma dopamine specifically in response to sauna-style whole-body heat exposure that would fill this gap; the evidence base here is limited to the human hormonal studies above, none of which assayed dopamine.
Mechanism
Heat exposure in a sauna raises core body temperature and heart rate, which the body meets with a sympathetic nervous system response: norepinephrine release, redirection of blood flow to the skin, and changes in pituitary hormones like prolactin and growth hormone13. This is a genuine and well-documented stress response. Whether any of it extends to dopamine release in the brain’s motivation circuits is plausible by analogy with other stressors, but it is an inference, not a finding — no study has tested it for sauna specifically.
This matters because sauna use is widely recommended for mood and wellbeing, often with dopamine cited as the mechanism. The honest position is narrower: sauna reliably changes norepinephrine, prolactin and growth hormone, and any benefit to mood may run through those pathways, general relaxation, heat-induced changes in blood flow, or expectation effects, none of which require a dopamine change that has never actually been measured.
Anyone encountering a specific dopamine percentage attached to sauna use online should treat it as unsourced, since it does not match the measured outcomes of any study identified in the physiology literature on Finnish or comparable sauna bathing.
It is worth contrasting this directly with cold-water immersion, where the popular “dopamine boost” claim at least traces back to a real, if small and inconsistent, plasma measurement1 (see the cold showers page). Sauna use has no equivalent starting point: there is not even a single study to point to and qualify, only an absence of measurement. That absence is a legitimate, useful piece of information in its own right — it means anyone repeating a dopamine figure for sauna is not simplifying a real result, they are inventing one.
None of this rules out a genuine mood or alertness benefit from regular sauna use; growth hormone, prolactin and norepinephrine changes, along with relaxation, heat-induced vasodilation and simple routine, are all plausible contributors that do not require an unmeasured dopamine effect3. Anyone specifically interested in whether sauna use affects mood or motivation through dopamine should treat that as an open, currently untested question, not a settled mechanism.
Evidence strength
Every identified human sauna study measured norepinephrine, epinephrine, prolactin, growth hormone or cortisol, not dopamine 123. No PET, microdialysis or plasma-dopamine study of sauna bathing in humans was found, so there is nothing to grade the claim against.
Common claims
| What people say | What the evidence says |
|---|---|
| Sauna sessions give you a dopamine hit like a cold plunge | Unproven — no sauna study has measured dopamine |
| Sauna use is relaxing because it lowers stress hormones | Mixed — growth hormone and norepinephrine rise, cortisol response is inconsistent |
What the evidence supports
What the evidence does not support
- Sauna studies consistently measured norepinephrine, prolactin, growth hormone, renin activity and cortisol — never dopamine — which means the absence of evidence is itself informative about how this claim has been tested 123.
- The catecholamine most reliably raised by sauna heat is norepinephrine, not dopamine, in every study identified 12.
Potential risks
Sauna use raises heart rate and blood pressure acutely and has a documented cardiovascular load 3; this is a genuine physiological stress response rather than a dopamine effect.
What we know
- Sauna heat exposure produces a large, reliable rise in plasma norepinephrine, in the range of an 86% mean increase in one study of women during a Finnish sauna session 1.
- The same study found a variable, not statistically significant, change in epinephrine, beta-endorphin, corticotropin and cortisol 1.
- A comparative study of sauna combined with ice-water immersion or cold showers found norepinephrine rose significantly after exposure, with a near-doubling of epinephrine in the sauna-plus-ice-water condition 2.
- An earlier study of Finnish sauna bathing found a significant rise in growth hormone and plasma renin activity, with no significant change in blood glucose or insulin 3.
- None of the identified studies of human sauna use measured dopamine in blood or brain 123.
What we don’t know
- Whether sauna heat exposure changes plasma dopamine at all, since it has not been measured in the published physiology literature on sauna bathing.
- Whether sauna use changes dopamine release in the brain’s reward circuits, which would require PET or microdialysis evidence that does not currently exist for this specific exposure.
- Whether any dopamine effect of sauna use would resemble the mixed plasma findings seen in cold-water immersion studies, given the different physiological demands of heat versus cold stress.
How sure are we?
- Very confident
- Reasonably confident
- Uncertain
- Very uncertain
Very uncertain. The relevant measurement has simply never been taken in sauna research 123.
Confidence describes how settled the answer on this page is, not how important the topic is. It can change as new research is published.
What would change the answer?
The evidence that is currently missing:
- A plasma dopamine assay taken during or after a sauna session
- A PET or microdialysis study of dopamine during sauna heat exposure
- Any published human sauna study that measures dopamine at all
Common misconception
Sauna sessions boost dopamine the way cold plunges supposedly do.
Key studies
- Eleven healthy women exposed to intense Finnish sauna heat, with plasma beta-endorphin, prolactin and catecholamines measured; norepinephrine and prolactin rose significantly, other hormones did not change significantly versus a no-heat control.1
- Nine winter-swimming men exposed to combinations of sauna, ice-water immersion and cold showers, with plasma ACTH, cortisol, melatonin and catecholamines measured; norepinephrine rose significantly after exposure and epinephrine nearly doubled in the sauna-plus-ice-water condition.2
- Fifty-five healthy volunteers studied in a Finnish sauna, with growth hormone, insulin, renin activity, blood glucose and urinary catecholamine metabolites measured; growth hormone and renin activity rose significantly, insulin and glucose did not change.3
Medical and safety guidance
Sauna heat exposure raises heart rate and places a cardiovascular load on the body; people with heart conditions, low blood pressure or who are pregnant should check with a GP before regular sauna use.
The bottom line
No published human sauna study has measured dopamine at all. Sauna reliably raises norepinephrine, and sometimes prolactin and growth hormone, but any ‘dopamine boost’ claim for sauna is an assumption, not a tested finding.
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References
- 1. Laatikainen T, et al. Response of plasma endorphins, prolactin and catecholamines in women to intense heat in a sauna. European journal of applied physiology and occupational physiology. 1988. PMID 2830109. doi:10.1007/BF00691246
- 2. Kauppinen K, et al. Some endocrine responses to sauna, shower and ice water immersion. Arctic medical research. 1989. PMID 2789570.
- 3. Lammintausta R, et al. Change in hormones reflecting sympathetic activity in the Finnish sauna. Annals of clinical research. 1976. PMID 999213.