Why are Onsen good for the body?
Point1. Scientific benefits and effects
The chemical ingredients found in onsen can be absorbed by the body both when bathed in and when drunk. Various pharmacologic effects are produced from the different types of hot spring. These work comprehensively and bring about positive benefits for your health.
Point2. Physical benefits and effects
Benefits from heat: Stimulates and accelerates metabolism and maintains your autonomic nervous system. Benefits from water pressure: Depending on the level of pressure, this can be beneficial for movement, and can effectively massage your body's muscles. Benefits from buoyancy: This can help to reduce the burden on your body, helping you to relax, and rehabilitate your mental and physical state.
Point3. The positive effects of a change of air and scenery.
Onsen aren't just about the act of soaking in fresh hot water. Gazing at the sky or the sea, hearing the gentle murmuring of a river...These kinds of scenes are far away from the usual bustling activity of Japan's bustling towns and cities, and are catalysts for relieving stress, and mental fatigue. Our onsen have ideal climates for restoring, and improving your health.
A general guide to the medicinal benefits of hot spring
Evidence suggests that bathing in Onsen can be beneficial for various illnesses and conditions.

[Conditions that can benefit from Onsen]

Neuralgia (nerve pains), muscle/joint pain, stiff shoulders, stiff joints, bruises, sprains, chronic gastrointestinal disorders, hemorrhoids, sensitivity to cold, post-illness rehabilitation, relief from fatigue, general improvement of health, etc.
Type of Onsen Beneficial for (explanatory notes: (A) bathing, (B) drinking, (C) bathing and drinking)
Simple Thermal Onsen (containing less than one thousand ppm of dissolved minerals) Applies to numerous mild/minor ailments
Saline Onsen Chloride Spring Chronic gastrointestinal disorders (B) , Chronic constipation (B) , Wounds / cuts (A) , Burns (A) , Chronic dermatitis (A) , Weak constitution (A) , Chronic gynecological disorders (A)
Sodium Bicarbonate Saline Spring Chronic gastrointestinal disorders (B) , Liver problems (B) , Wounds / cuts (A) , Burns (A) , Chronic dermatitis (A) , Diabetes (B) , Gout (B)
Sulphate Spring Chronic constipation (B) , Obesity (B) , Wounds / cuts (A) , Burns (A) , Chronic dermatitis (A) , Arteriosclerosis (A) , Diabetes (B) , Gout (B) , Inflammation of the gall-bladder (B) , Gallstones (B)
Onsen containing
special ingredients
Carbon Dioxide Spring Chronic gastrointestinal disorders (B) , Chronic constipation (B) , External wounds (A) , Burns (A) , Arteriosclerosis (A) , Hypertension (A)
Ferruginous Spring (Iron) Anemia (B) , Menstrual disorders (A)
Cupriferous (Copper) / Ferruginous Spring Anemia (B) , Menstrual disorders (A)
Sulphur Spring Chronic constipation (B) , External wounds (A) , Chronic dermatitis (A) , Chronic gynecological disorders (A) , Arteriosclerosis (A) , Hypertension (A) , Diabetes (C) , Gout (B)
Acidic Spring Chronic gastrointestinal disorders (B) , Chronic dermatitis
Radium Spring Joint pain (B) , Muscle pain (B) , Neuralgia (B) , Chronic gastrointestinal disorders (B) , Chronic dermatitis (A) , Chronic gynecological disorders (A) , Arteriosclerosis (A) , Hypertension (A) , Gout (C) , Gallstones (C) , Inflammation of the gall-bladder (C)
A general guide to the adverse effects that hot spring can have for certain medical conditions
It is strongly advised that you do not attempt to bathe in Onsen when afflicted with certain illnesses and/or ailments.

[Onsen can have a negative effect on the following conditions]

Acute illnesses (particularly when accompanied by a fever), tuberculosis, malignant tumours, serious heart diseases/problems, respiratory problems, kidney problems, haemophilia, anaemia, during pregnancy (particularly during the initial and final stages of a pregnancy), and in general any illnesses/conditions that have significantly deteriorated an individuals health, or affected an individual for a considerable period of time.
Type of Onsen Conditions bathing is not advised for Conditions drinking is not advised for
Salt Onsen Chloride Spring

Sodium Bicarbonate Saline Spring

Should generally not be used by those with any of the aforementioned conditions Kidney problems, High Blood Pressure, Swelling in any part of the body, those with thyroiditis (or problems with the thyroid gland) should avoid entering baths that contain iodine.
Sulphate Spring Should generally not be used by those with any of the aforementioned conditions Those who have diarrhea should be particularly careful
Onsen containing
special ingredients
Carbon Dioxide Spring Should generally not be used by those with any of the aforementioned conditions Those who have diarrhea should be particularly careful
Sulphur Spring

Acidic Spring

In particular those with a hypersensitivity to light (Springs containing hydrogen sulphide), those who have sensitive skin and/or sensitive respiratory systems, and elderly people with dry skin conditions. Those who have diarrhea should be particularly careful
Guests who are affected by any of the above ailments and who wish to bathe, or undergo medicinal treatment by Onsen should consult a medical specialist, GP or balneotherapy expert before using any hot springs.
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