湯Simple
A gentle simple thermal spring — hot at 45.6 °C, with neutral pH and hypotonic mineralization, served as free-flow source water (kakenagashi). With little chemical bite, it relies on heat and water volume rather than mineral punch, and the posted indications list the usual constellation of nerve pain, muscle ache, joint stiffness, and post-illness recovery.
Good for
Aches & joints
Warmth eases stiffness and raises the pain threshold. Radon and sulfate springs show the strongest evidence for joint and muscle pain.
stiff shoulders
On the certificate:NeuralgiaMuscle painJoint painFrozen shoulderMotor paralysisJoint stiffnessBruisesSprains
Recovery
Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.
fatigue, stress
On the certificate:ConvalescenceFatigue recoveryGeneral health improvement
Take care
Contraindications
- Acute illness (especially when fever is present)
- Active tuberculosis
- Malignant tumor
- Severe heart disease
- Respiratory failure
- Renal failure
- Bleeding disorders
- Severe anemia
- Any illness in an actively progressing stage
- Pregnancy (especially the early and late stages)
Measured at the source
Source temperature
45.6°C
Hot
Tonicity
Hypotonic
On the certificate
- Chronic digestive disorders
- Hemorrhoids
- Cold sensitivity
Evidence
- Maeda M. 温泉の医学的効果とその科学的根拠. J. Hot Spring Science 70:197–207, 2021.
- Donaubauer AJ et al. Serial radon spa therapy on pain in musculoskeletal disorders. Frontiers in Immunology, 2024.
- Verhagen AP et al. Balneotherapy for rheumatoid arthritis. Cochrane Database of Systematic Reviews CD000518, 2015.
- Takeda M et al. Hot spring bathing practices have a positive effect on mental health in Japan. Heliyon 9(9):e19631, 2023.