Hot Baths and Warm Water for Sore Muscles and Exercise Recovery: What Is Known
What reviews and small trials found about hot or warm baths, heat and contrast water for sore muscles after exercise, how they compare with cold water, and when soreness is an injury.
Content last updated . This page has not been medically reviewed.
What Was Studied
The trials below mostly studied healthy, physically active volunteers with delayed onset muscle soreness (DOMS), soreness that follows exercise. Outcomes are mostly self-rated soreness, plus some strength or jump tests and blood markers of muscle damage. Participants know whether they sat in hot water, so expectation is part of the result.Heat for Soreness: Reviews
- A 2021 meta-analysis of 32 randomized trials (1,098 people) found that both cold and heat reduced soreness-related pain, with no significant difference between cold and heat. [3] Its strongest heat result came from hot packs, not baths. [3] The authors said more high-quality studies are needed to say which works better. [3]
- A 2022 network meta-analysis of 59 studies (1,367 people) compared ten approaches, including hot or warm-water immersion and contrast water. Hot packs ranked best for pain within 24 hours, followed by contrast water, but the authors said study quality was limited and firm conclusions need better research. [4]
- A 2025 systematic review of whole-body heat after exercise (hot water immersion or sauna; 14 studies, 194 participants) found mixed results in its nine acute-recovery studies: four showed no effect, four showed benefit and one showed an adverse effect. The authors said no definitive conclusions can be drawn. [5]
Evidence label: mixed, mostly low quality.
Hot Water Versus Cold Water in One Trial
A trial of 30 physically active men induced muscle damage with exercise, then compared recovery in 11 °C water, 41 °C water or a 36 °C warm-bath comparison. [6] The authors reported that the hot immersion improved recovery of explosive strength (late-phase rate of force development) compared with cold. [6] This is one small trial in men with a follow-up of 48 hours. It is promising but limited, not a rule.Cold and Contrast Water, for Comparison
- A Cochrane review of 17 small, low-quality trials (366 people) found some evidence that cold-water immersion reduces delayed soreness compared with rest, and found no difference in pain compared with warm-water immersion in four studies. [7] Most trials did not actively track side effects. [7]
- A 2022 meta-analysis of 52 studies found no significant effect of cold-water immersion on strength recovery. [8]
- A 2013 meta-analysis of contrast water therapy (alternating warm and cold) included 18 trials, all at high risk of bias, and found little difference between contrast therapy and other popular recovery methods. [9] A 2024 network meta-analysis of 57 studies in healthy participants ranked contrast immersion best for one blood marker of muscle damage. [10]
Cold plunge and ice bath evidence belongs to the Biohacking pages: see cold-water immersion evidence summary, recovery claims versus long-term adaptation and cold and heat exposure.
Epsom Salts and Other Additions
Bath salts for sore muscles are a separate claim. See Epsom salt baths: claims and evidence.| Question | What the sources found | Label |
|---|---|---|
| Heat vs soreness | Both heat and cold reduced reported pain; hot packs strongest | Mixed |
| Hot-water immersion for recovery | Mixed across 14 studies; one small trial favored it | Mixed |
| Cold-water immersion | Some soreness benefit vs rest; no strength effect | Mixed |
| Contrast water | Little difference vs other methods; high risk of bias | Insufficient evidence |
For general advice see recovery after exercise.
Frequently asked questions
Does a hot bath help sore muscles?
Reviews found heat reduced reported soreness, but the strongest results came from hot packs, and quality was limited. [3][4]
Is heat or cold better after a workout?
A 2021 meta-analysis found no significant difference between cold and heat for soreness-related pain. [3]
Should I use a hot bath on a new sprain?
The NHS advises avoiding heat such as hot baths for the first couple of days after a sprain or strain. [1]
Does a hot bath speed up muscle recovery?
A systematic review of 14 studies found no definitive answer. [5]
When is muscle pain a reason to get checked?
The NHS lists a very painful or worsening injury, and being unable to put weight on it, as reasons to seek urgent help. [1]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Safety First: Soreness Is Not Always Soreness
Heat after hard exercise adds risk. Heatstroke is a medical emergency, the NHS says. [2] Read heat illness and overheating and fainting after hot water. Do not combine hot water with alcohol. Check with a clinician first if you have heart or blood pressure problems, are pregnant, or have reduced skin sensation. This page gives no temperature or time to follow; figures below are what studies used.
References
- NHS. Sprains and strains. Read 2026-10-22.
- NHS. Heat exhaustion and heatstroke. Read 2026-10-22.
- Wang Y et al. Heat and cold therapy reduce pain in patients with delayed onset muscle soreness: A systematic review and meta-analysis of 32 randomized controlled trials. Phys Ther Sport (2021). PubMed record. Read 2026-10-22.
- Wang Y et al. Effect of cold and heat therapies on pain relief in patients with delayed onset muscle soreness: A network meta-analysis. J Rehabil Med (2022). PubMed record. Read 2026-10-22.
- Ahokas EK et al. Effects of Post-Exercise Heat Exposure on Acute Recovery and Training-Induced Performance Adaptations: A Systematic Review. Sports Med Open (2025). PubMed record. Read 2026-10-22.
- Benoit S et al. Hot But Not Cold Water Immersion Mitigates the Decline in Rate of Force Development Following Exercise-Induced Muscle Damage. Med Sci Sports Exerc (2024). PubMed record. Read 2026-10-22.
- Bleakley C et al. Cold-water immersion (cryotherapy) for preventing and treating muscle soreness after exercise. Cochrane Database Syst Rev (2012). PubMed record. Read 2026-10-22.
- Moore E et al. Impact of Cold-Water Immersion Compared with Passive Recovery Following a Single Bout of Strenuous Exercise on Athletic Performance in Physically Active Participants. Sports Med (2022). PubMed record. Read 2026-10-22.
- Bieuzen F, Bleakley CM, Costello JT. Contrast water therapy and exercise induced muscle damage: a systematic review and meta-analysis. PLoS One (2013). PubMed record. Read 2026-10-22.
- Chen R et al. The effects of hydrotherapy and cryotherapy on recovery from acute post-exercise induced muscle damage - a network meta-analysis. BMC Musculoskelet Disord (2024). PubMed record. Read 2026-10-22.