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Explanations by Spring Quality
This page introduces General Indications and Contraindications, also Indications and Contraindications for each Spring Quality.
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③Hydrogen carbonate springs
炭酸水素塩泉
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Skin keratin-softening "Hot springs for beautiful skin" / Refreshing after bathing
Hot springs with more than 1,000 mg of dissolved substances (excluding gaseous substances) in 1 kg of hot spring water and with hydrogen carbonate ion（HCO3-）as the main anionic component.
The hydrogen carbonate ions enhance skin cleansing and promote disinfection and antibacterial action on wounds, thus helping to treat Cuts. It also promotes the removal of dead skin cells and the retention of moisture in the skin, which can be expected to improve Dry skin conditions. Furthermore, the contained carbon dioxide (CO₂) is absorbed into the body through the skin, dilating peripheral blood vessels and improving blood flow, thus having an effect on Peripheral circulatory disturbance. The improved blood flow also relieves the symptoms of Sensitivity to cold.
Hydrogen carbonate springs are classified according to the main component of cations as follows.
（1）Calcium (Magnesium) - Hydrogen carbonate springs (old name: sodium bicarbonate springs)
In many cases, it contains carbon dioxide and iron. The presence of earth elements such as calcium and magnesium also provides sedative and anti-inflammatory effects, and is good for allergic diseases, chronic skin diseases, and hives.
When drunk, it lowers blood glucose levels and is good for Impaired glucose tolerance (diabetes). It is also effective in Hyperuricemia (gout) because it promotes the excretion of uric acid as well as diuresis.
（2）Sodium – Hydrogen carbonate springs (old name: Sodium bicarbonate springs)
The pH value has a high probability of being alkaline and often contains sodium-chloride or sodium-sulfate.
Sodium hydrogen carbonate, or sodium bicarbonate is stimulates blood circulation and softens dead skin cells (emulsification phenomenon). And it is called "Hot springs for beautiful skin" because it is expected to have a cleansing effect that removes sebum and dirt like soap and makes the skin smooth. The skin's protective power is weakened due to the reduced amount of sebum, which makes it easier for moisture on the skin surface to evaporate, also known as "Hot springs for refreshing(with cooling effect) ". When drunk, the spring neutralizes gastric acid and produces carbon dioxide gas that stimulates the gastric mucosa, making it active and aiding digestion. That is why Gastroduodenal ulcers and Reflux esophagitis are among the spring-specific indications for drinking. Also good for Cholelithiasis, Chronic cholecystitis, and Impaired glucose tolerance (diabetes) because it stimulates the secretion of liver juices and improves the function of the liver and pancreas.
Indications by Spring Quality For bathing Cuts, Peripheral circulatory disturbance, Sensitivity to cold, Dry skin For drinking Gastroduodenal ulcers, Reflux esophagitis, Impaired glucose tolerance (diabetes), Hyperuricemia (gout) Contraindications by Spring Quality For bathing None For drinking None - ■Old spring quality name・・・Bicarbonate earth springs／Sodium bicarbonate springs
- ■Color of hot water・・・Clear and colorless, but sometimes yellowish brown or greenish brown
- ■Taste & Smell・・・
“Calcium (Magnesium)–Hydrogen carbonate springs” may have a bitter, metallic or medicinal odor.
“Sodium–Hydrogen carbonate springs” have a medicinal taste characteristic of baking soda, but is easy to drink; may have a metallic or medicinal odor. - ■Water texture・・・Smooth feeling
- ■Major hot spring inns・・・
「Sodium - Hydrogen carbonate spring」"Ryokan Onuma" Higashi-Naruko Onsen, Miyagi Prefecture
「Carbon dioxide containing－Magnesium・Sodium・Calcium－Hydrogen carbonate spring」"Marucho Ryokan" Nagayu Onsen, Oita Prefecture
「Sodium・Calcium・Magnesium－Hydrogen carbonate spring」"Wasurenosato Gajyoen" Myoken Onsen, Kagoshima Prefecture
| General Indications ※Indications for all spring quality |
For bathing | Chronic pain or stiffness of muscles or joints (chronic phase of rheumatoid arthritis, osteoarthritis, lower back pain, neuralgia, frozen shoulder, bruises, sprains, etc.), muscle stiffness by motor paralysis, sensitivity to cold, peripheral circulatory disturbance, gastrointestinal hypofunction (slow digestion, intestinal gas formation, etc.), mild hypertension, impaired glucose tolerance (diabetes), mild hypercholesterolemia, mild asthma or emphysema, pains of hemorrhoidals, autonomic instability, various symptoms from stress (sleep disorders, depression, etc.), restorative phase from illness, recovery from fatigue, health promotions |
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| For drinking | ※There is no general indications for drinking. |
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| General Contraindications ※Contraindications for all spring quality |
For bathing | Active stage of diseases (especially when fever is accompanied), active tuberculosis, advanced malignant tumor, or the case of significant debility involving severe anemia, severe cardiac or lung diseases involving suffocation feelings with a little movement, severe kidney disease involving edema, gastrointestinal bleeding, when there is visible bleeding, acute exacerbation stage of chronic diseases, etc. |
| For drinking | ※There is no general contraindications for drinking. |