Can onsen help with acid reflux?

Drinking bicarbonate spring water has a recognised indication. However, bathing can increase abdominal pressure and may worsen reflux. Pay attention to posture and meal timing, and consult your doctor.

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

Applicable spring types

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Analysis records

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Bicarbonate (HCO₃⁻) ions in bicarbonate spring water raise gastric pH, counteracting excess acid and reducing oesophageal irritation. Traditional usage involves drinking 100–150 mL about 30 minutes before meals.

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References

Explore Spring Types for This Condition

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

SYMPTOMSMay 6, 2026· 1min read

Gastric & Duodenal Ulcers | Bicarbonate Spring Drinking Indication Explained

Japan's Ministry of the Environment recognises bicarbonate springs as having a drinking indication for gastric and duodenal ulcers. Bicarbonate ions (HCO₃⁻) neutralise excess gastric acid and soothe inflamed mucosa. Note: active or bleeding ulcers are a contraindication. Always consult your doctor.

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).