湯Simple
A hot simple thermal spring: the source emerges at about 49 °C and is brought down to 40 °C at the bathing point. As a simple spring with under 1,000 mg/kg of dissolved solids, the water is gentle and low in irritation, and the certificate lists relief of autonomic-nervous instability, insomnia, and mild depressive states among its bathing indications.
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
Recovery
Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.
fatigue, stress
On the certificate:autonomic nervous instabilityinsomniamild depressive states
Take care
Contraindications
- the acute phase of any illness (especially when fever is present)
- active tuberculosis
- advanced malignant tumors or severe anemia and other states of marked physical weakness
- serious heart or lung disease causing breathlessness on slight exertion
- serious kidney disease accompanied by edema
- active bleeding such as gastrointestinal hemorrhage
- acute exacerbation of a chronic disease
Measured at the source
Source temperature
49.4°C
Hot
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.