Can I use onsen if I have a gastric ulcer?

Bathing is generally safe during remission but is contraindicated during active or bleeding phases. Drinking bicarbonate spring water in prescribed amounts may help, but only with your doctor's approval.

Gastric & Duodenal Ulcers | Bicarbonate Spring Drinking Indication Explained

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How bicarbonate spring water helps peptic ulcers

Bicarbonate springs (sodium bicarbonate type or magnesium bicarbonate type) are rich in HCO₃⁻ ions, which neutralise excess hydrochloric acid in the stomach. This reduces irritation to the gastric and duodenal mucosa. The tradition of drinking these springs for digestive conditions dates back centuries in Japan.

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References

Explore Spring Types for This Condition

Bicarbonate Springs: "Beauty Waters" for Smooth, Glowing Skin →

SYMPTOMSMay 6, 2026· 1min read

Gastroesophageal Reflux (GERD) & Onsen | Bicarbonate Springs for Acid Neutralisation

Gastroesophageal reflux disease (GERD) involves stomach acid irritating the oesophagus. Japan's Ministry of the Environment recognises bicarbonate spring water as having a drinking indication for reflux, as bicarbonate ions raise stomach pH and reduce acid irritation. Consult a doctor for persistent symptoms.

SYMPTOMSMay 6, 2026· 1min read

Poor Gastrointestinal Function & Onsen | Carbon Dioxide Springs Explained

Reduced gastrointestinal function carries a bathing indication across all 10 Japanese spring types. Carbon dioxide springs additionally hold a drinking indication: CO₂ stimulates gastric motility and secretion, aiding digestion. The parasympathetic activation from thermal bathing also normalises digestive function.

SPRING TYPEMay 5, 2026· 2min read

Bicarbonate Springs: "Beauty Waters" for Smooth, Glowing Skin

Bicarbonate springs (HCO₃⁻ as the main anion) are known as "the beauty waters" because bicarbonate gently removes dead skin cells and sebum, leaving skin silky smooth. Indicated for bathing (cuts, cold sensitivity, dry skin) and drinking (gastroduodenal ulcers, diabetes, gout).