湯Simple
A simple thermal spring drawn from 800 m below Osaka's Taisho ward, emerging at 37.4 °C. It is weakly alkaline (pH 7.9), soft on the skin and gentle in character, sitting in Japan's beauty-water family. The posted indications cover nerve pain, muscle ache, joint pain, poor circulation and recovery from fatigue.
Good for
Smooth skin
Bicarbonate and alkalinity gently lift dead keratin while silica hydrates, leaving skin smooth. This is the basis of the beautifying-water (bijin-no-yu 美人の湯) reputation.
dry, rough skin
Recovery
Warmth and buoyancy lower stress markers and improve sleep; habitual bathing is linked to lower rates of depression.
fatigue, stress
On the certificate:recovery after illnessrecovery from fatiguehealth promotion
Take care
Contraindications
- acute illness (especially when accompanied by fever)
- active tuberculosis
- malignant tumors
- severe heart disease
- respiratory failure
- renal failure
- hemorrhagic diseases
- severe anemia
- other generally progressing illnesses
- pregnancy (especially early and late stages)
Measured at the source
Source temperature
37.4°C
Warm
Tonicity
Hypotonic
Flow rate
280L/min
Typical
On the certificate
- neuralgia
- muscle pain
- joint pain
- frozen shoulder
- motor paralysis
- joint stiffness
- bruises
- sprains
- chronic digestive disorders
- hemorrhoids
- sensitivity to cold
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.
- Naito Y et al. A Hot-Spring Water Improves Inflammatory Conditions in an Atopic Dermatitis Model. Biomedicines 13(11):2707, 2025.
- Li H et al. Bicarbonate Ionized Water Bathing Enhances Natural Killer Cell Activity. Scientific Reports 14:51851, 2024.
- Takeda M et al. Hot spring bathing practices have a positive effect on mental health in Japan. Heliyon 9(9):e19631, 2023.