10 Types of Hot Springs in Japan
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It’s true that Japanese hot springs (onsen) are known for their diverse characteristics, including chemical components, taste, and texture. These factors contribute significantly to their perceived health benefits and appeal.
In Japan, hot springs are classified based on their chemical composition, regardless of their therapeutic efficacy. However, it’s often believed that certain minerals in the water can have health benefits.
Index of This Article
Simple hot spring
Characterized by its gentle touch, non-irritating nature, and skin-friendly attributes, a Simple Hot Spring becomes notable for the soothing sensation it imparts. Alkaline variations further enhance this experience, leaving your skin remarkably “smooth” after each bath. Recommended for conditions such as autonomic instability, insomnia, and depression.
Chloride spring
Springs are categorized into sodium-chloride, calcium-chloride, magnesium-chloride, etc., based on the predominant cation component. This spring type is widespread in Japan, known for its salty taste attributed to the high salt concentration. Elevated magnesium content may add a bitter note. Recommended for addressing concerns like cuts, peripheral circulation disorders, sensitivity to cold, depression, beauty and anti aging.
Hydrogen carbonate spring
Classification is based on the primary cation, resulting in sodium-bicarbonate, calcium-bicarbonate, magnesium-bicarbonate springs, among others. Calcium-bicarbonate springs may generate calcareous deposits and precipitates. Indicated for cuts, peripheral circulation disorders, sensitivity to cold, and dry skin.
Sulfate spring
Categorized by the predominant cation, springs are differentiated into sodium-sulfate, calcium-sulfate, magnesium-sulfate, and others. Commonly indicated for cuts, peripheral circulation disorders, sensitivity to cold and depression.
Note: Individuals with sensitive or dry skin should exercise caution when bathing in sulfur springs, as the potent waters can be irritating. Monitor your skin’s reaction closely and avoid overexposure to prevent discomfort.
Carbon dioxide spring
Spring bath carbonated bubbles envelop your body, providing a invigorating sensation. Yet, be mindful, as heating may lead to the evaporation of carbon dioxide gas. When consumed, relish the refreshing carbonated taste. This hot spring type, often referred to as “Awa no Yu” (泡の湯) is relatively uncommon in Japan. Indicated for bathing, and beneficial for cuts, peripheral circulation disorders, sensitivity to cold, and autonomic nervous instability.
Iron-containing spring
Hot spring water is rich in total iron ions, categorized into bicarbonate and sulfate types based on the anion. Upon gushing out and meeting the air, the iron undergoes oxidation, resulting in a reddish-brown hue.
Note: Individuals with sensitive or dry skin should exercise caution when bathing in sulfur springs, as the potent waters can be irritating. Monitor your skin’s reaction closely and avoid overexposure to prevent discomfort.
Acidic spring
These springs have a low pH, which is believed to have a bactericidal effect. They are often recommended for skin conditions, but caution is advised for those with sensitive skin.
Iodine containing spring
This water is known for its strong bactericidal properties, its ability to lower cholesterol levels, and its effectiveness in preventing arteriosclerosis. However, those with hyperthyroidism should avoid it due to contraindications. Typically found in non-volcanic hot springs, the water may develop a yellow tint over time.
Sulfur spring
Categorized into sulfur and hydrogen sulfide types, this hot spring variation is relatively prevalent in Japan. The distinct odor resembling rotten eggs is attributed to hydrogen sulfide. Indicated for conditions such as atopic dermatitis, plaque psoriasis, chronic eczema, and epidermal suppuration. For the hydrogen sulfide type, peripheral circulation disorders are an additional indication.
Individuals with sensitive or dry skin should exercise caution when bathing in sulfur springs, as the potent waters can be irritating. Monitor your skin’s reaction closely and avoid overexposure to prevent discomfort.
Radioactive spring
This is a unique category. While “radioactive” often has negative connotations, these springs have low levels of natural radioactivity, which some believe to have health benefits.
Research has demonstrated that minimal amounts of radioactivity can have positive effects on the human body. Indications include hyperuricemia (gout), rheumatoid arthritis, ankylosing spondylitis, anti-aging benefits, and promoting smooth skin.
