Ancient wisdom & traditional movement practices
Hot Springs, Saunas and Onsen: Heat Traditions and Joint Comfort
4-minute read · Published April 4, 2025 · Updated April 4, 2025
Why this happens / What this is
Heat can make a warm bath or sauna feel good. That feeling is real, and many people enjoy it after a long day.
Some traditions use hot water pools, others use dry or steam heat rooms. The shared thread is comfort and rest, not a promise about any particular joint.
It helps to separate three things. The first is how a warm place feels. The second is whether heat changes the joint itself. The third is whether it is safe for you. Only the first is easy to judge for yourself. The other two have little research behind them.
What the research says
- There isn't strong research on saunas or onsen for shoulder pain specifically, so we can't say they reduce pain or improve function.
- Frozen shoulder, a condition where the shoulder becomes stiff and painful, does not reliably clear up on its own. Untreated cases improved only partly over one to four years in one review [R19]. Research does not support waiting it out, so a clinician should assess a stiffening shoulder.
What you can do
- Enjoy heat for comfort, with care. Stay hydrated, keep sessions short and step out if you feel dizzy. Seated option: sit on a bench or chair in the sauna or warm room.
- Check with a clinician first. Ask before heat if you have a heart condition, take blood pressure medicine or have a shoulder that is hot, swollen or bruised.
- Do not wait out a stiffening shoulder. If your shoulder is getting stiffer over weeks, book an assessment. Seated option: you can describe your symptoms in an appointment while sitting.
- Write down what you notice. Track how your shoulder feels before and after heat, and bring the notes to your clinician.
Where ShoulderBack Pro fits — and where it doesn't
ShoulderBack Pro doesn't fit this topic: it is a movement trainer, not a heat tool, and it doesn't change how a joint responds to warmth. For joint pain or stiffness, a clinician is the right first step. If you want gentle movement for its own sake, the routines page is there.
When to see a professional
See a doctor or physiotherapist promptly if you have: pain after a fall or injury with sudden weakness or loss of movement; a shoulder that looks deformed, very swollen or bruised; fever or feeling unwell alongside the pain; chest pain or breathlessness (call emergency services); constant pain that doesn't change with rest or activity; pain that wakes you most nights; numbness, tingling or weakness into the arm or hand; pain in several joints at once; or pain that hasn't improved after a couple of weeks of sensible self-care.
Only a doctor, physiotherapist or other qualified clinician can diagnose the cause of your joint pain.
Try this movement
Around the World (circles, both arms) →Frequently asked questions
Does heat help a stiff shoulder?
Many people find heat comforting, and that comfort is real. The evidence that heat changes a joint's condition is limited, so treat any claim that it repairs a shoulder as unproven.
Are saunas or onsen safe for everyone?
Not necessarily. Ask a clinician first if you have a heart condition, take blood pressure medicine or have a shoulder that is hot, swollen or bruised.
Should I wait out a shoulder that is getting stiffer?
No. Frozen shoulder does not reliably clear on its own, so a stiffening shoulder deserves an assessment rather than a wait.
Sources
- Wong CK et al. (2017). Natural history of frozen shoulder: fact or fiction? A systematic review. Physiotherapy. https://pubmed.ncbi.nlm.nih.gov/27641499/
More in this topic
Essential guide: Ancient Wisdom for Strong Shoulders: What Traditional Movement Got Right (and What Science Adds)
The Chinese Medicine Clock and Morning Movement: Fun Framing, Real Habit
Cold Water and Shoulders: From Nordic Plunges to Modern Ice Baths
Ancient Massage Traditions: Thai, Tui Na, Lomi Lomi — Comfort vs Proof