Spring types effective for constipation
Japan's Ministry of the Environment lists three spring types with drinking indications for reduced gastrointestinal function (constipation). Each type's active mineral components act directly on the intestinal tract.
Salt stimulates gastrointestinal secretion and intestinal motility — historically used as a "drinking cure"
Sulphate ions (SO₄²⁻) stimulate intestinal mucosa and promote peristalsis; sodium sulphate springs are especially noted for constipation
Bicarbonate ions (HCO₃⁻) protect gastrointestinal mucosa while normalising digestive function; also beneficial for constipation associated with acid reflux or gastritis
The minerals behind the effect
Retains water in the gut and stimulates the bowel (laxative action) — the key drinking-cure mineral for constipation.
Promotes digestive secretion to aid bowel movement.
Protects the mucosa while regulating digestive function.
How to drink spring water and key precautions
- Only drink at facilities that permit it; always follow facility instructionsNot all hot spring water is safe for consumption, so you must only drink from designated sources at facilities approved for 'insen' (therapeutic water drinking). These locations will provide specific instructions on dosage and frequency, which must be followed for your safety.
- Typical guidance: ~150–200 mL per serving, 2–3 times a day, 30 minutes before mealsThis is a common recommendation for maximizing the therapeutic effects on digestion. Drinking a moderate amount on an empty stomach allows the spring's minerals to act directly on the gastrointestinal tract, helping to stimulate intestinal activity before food is introduced.
- Start with a small amount (~50 mL) on your first attemptYour body may react unexpectedly to the high mineral content of the spring water. Starting with a small dose allows you to gauge your individual tolerance and avoid potential adverse effects like stomach upset while your system adjusts to the treatment.
- Excessive drinking of high-sodium springs (chloride) may raise blood pressureChloride springs are effective for constipation due to their high salt content, which stimulates the digestive system. However, this same salt content can also lead to an increase in blood pressure if consumed in large quantities, so moderation is crucial.
- Stop immediately and consult a doctor if diarrhoea or abdominal pain occursWhile the goal is to stimulate bowel movements, symptoms like diarrhoea or stomach pain indicate that the treatment may be too strong for your system. Discontinue drinking the water immediately and seek medical advice to prevent dehydration or other complications.
Combined effect of drinking and bathing
Beyond the direct intestinal action of drinking, bathing activates the parasympathetic nervous system (the relaxation response), which also supports gut motility via the autonomic nervous system. Combining rest at a hot spring resort with drinking therapy may be an effective approach for chronic constipation.
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References
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