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    Onsen bath

    The word onsen means "hot spring" in German. An onsen bath is therefore a traditional Japanese hot spring bath whose water usually comes from natural springs and is heated geothermally. Onsen have been an integral part of Japanese bathing culture for centuries and are used for both relaxation and therapeutic purposes.
    History·Characteristics·Subspecies·Functionality·Indications & effect·Contraindications & side effects·Conclusion·FAQ·Sources

    History and tradition: where does the onsen bath come from?

    A traditional onsen

    The use of hot springs for bathing has a long tradition in Japan. The onsen bath has its origins in the tradition of communal bathing in the 7th century. At this time, Buddhism was spreading in Japan, where water played an important role in religious ceremonies and rituals as a symbol of purification.

    With the construction of Buddhist temples, the first forms of Japanese baths were also built. In the 13th century, a large, heatable tub was built in Nara together with the temple Tōdai-ji, which was originally used for the ritual purification of religious statues. At the same time, a kind of herbal sauna was built in the Hokki-ji temple in Ikaruga, which was mainly used to treat sick people. Over time, these early bathing facilities also opened up to the general population and laid the foundations for Japanese bathing culture. As recently as 200 years ago, every Japanese person visited a public bathhouse on average 25 times a month - in other words, almost every day.

    As the whole of Japan is located in a volcanically active area, onsen can be found almost everywhere in Japan. Places with many well-known healing springs developed into resort towns that often have the suffix "-Onsen" in their names, such as Kusatsu Onsen in Gunma Prefecture or Arima Onsen in Kōbe.

    Traditionally, onsen baths were not only places to relax, but also a social meeting place where village communities came together to bathe and socialize. Here, the whole village bathed together and unclothed, without gender segregation. It was only with the "westernization" during the Meiji Restoration in the 19th century that men and women were separated. Today, there are only a few onsen where bathing together without clothing is still permitted.

    With the equipping of private homes with full baths, going to the bathhouse is increasingly becoming a thing of the past. The supply of hot water is also taken for granted today. Nevertheless, many Japanese people hold on to the tradition and appreciate the special atmosphere and sense of community in an onsen bath - some still visit it every day.

    Characteristics: What makes an onsen bath?

    An onsen bath is characterized by its mineral-rich, geothermally heated water, which comes from natural hot springs. According to Japanese onsen legislation, the water must have a temperature of at least 25 °C, with the average temperature being around 41 °C. In addition, the baths must contain certain minerals such as sulphur, iron or radon in order to be recognized as onsen. These minerals are crucial for the therapeutic effect of the water.

    Traditionally, onsen baths are built outdoors as so-called rotenburo and are usually located in rural regions of Japan. Today's onsen usually have both an indoor and an outdoor pool. The indoor baths range from intimate, dimly lit rooms to spacious bathing halls with several pools. In the outdoor baths, visitors can bathe in the middle of nature, surrounded by lush greenery, rugged rocks or even on a cliff overlooking the sea.

    Onsen are often housed in rustic wooden buildings and feature classic elements such as shoji screens and stone baths. Modern facilities offer an elegant, minimalist design with state-of-the-art amenities.

    Many onsen are attached to ryokans (traditional Japanese inns) andoffer a holistic relaxation experience in addition to bathing, often complemented by regional kaiseki menus, massages or tea ceremonies. The houses are reminiscent of spas and are often invitingly decorated.

    Forms: What subtypes of onsen spas are there?

    • Sulphur onsen: Recognizable by its characteristic smell and often milky white water, which is said to help in the treatment of skin diseases and arthritis.
    • Iron onsen: The rust-red water is said to help with blood disorders due to its high iron content.
    • Sodium chloride onsen: The water has a salt content similar to seawater and is said to promote heat retention and relieve muscle pain, cuts and burns.
    • Carbonated onsen: The water is naturally sparkling and feels soft on the skin, which is said to have a positive effect on skin diseases.
    • Radium onsen: Traces of radioactive elements in the water are said to help lower blood pressure and alleviate gout or circulatory problems.

    There is a difference between an onsen bath and a sento, which is also a Japanese bathhouse. Unlike an onsen bath, a sento is located in urban residential areas and is filled with normal tap water.

    Procedure & rules: How does an onsen bath work?

    A visit to an onsen follows fixed rules, which are mainly about hygiene . In general, anyone visiting an onsen for the first time should get used to the water temperature slowly and start with short bathing times. In addition, an onsen should not be visited directly after a meal.

    When entering the onsen, first take off your shoes at the threshold. Then you go to the changing area, where you take off your clothes and store them in a basket or shelf provided for this purpose. Swimwear is not permitted in most onsen as it is considered unhygienic.

    Before entering the actual bath, it is compulsory to clean yourself thoroughly: To do this, you sit on a small stool and shower yourself with soap while sitting down. You must not stand up to avoid splashing other guests with water. After rinsing thoroughly, you can now immerse yourself in the hot water of the onsen bath. Many Japanese wear a small cloth (tenugui) on their head, which can also be used to dab sweat from the forehead and cover the genital area and tattoos on the way from the changing room to the bath. In order not to contaminate the water in the onsen, the important rule of conduct is that the tenugui must never come into contact with the water.

    There are special bathing slippers for the toilet area, which must be put on before entering. These and many other small rules show that hygiene is a top priority in the onsen.

    In addition to hygiene, great importance is attached to peace and quiet during your stay. Quiet conversations are allowed, but loud talking is not encouraged. Men and women usually bathe separately, although there are occasionally mixed baths. Tattoos are not permitted in many traditional onsen, as they are associated with yakuza, organized crime, in Japan.

    Social hierarchies are leveled in the relaxed atmosphere - in the onsen, the small employee sweats next to the company boss, without rank or status playing a role. Nevertheless, it is mostly families, friends or couples who visit an onsen together.

    Indications: How does the Japanese onsen bath work?

    Onsen baths have been proven to have a variety of health-promoting effects that contribute to a holistic and lasting sense of well-being.

    The warmth of the mineral-rich water can promote blood circulation, relax muscles and alleviate joint pain - for example in cases of chronic muscle tension, rheumatism or arthritis. For example, a 2012 study by Nur Kesiktas et al. showed that bathing in thermal water improves the quality of life and flexibility of muscles with chronic back pain.

    Bathing and taking a cold shower in between also stimulates the circulation , promotes blood flow to the skin and can therefore help to delay skin ageing. Skin diseases such as atopic eczema or metabolic disorders can also be positively influenced by the mineral components. At the same time, the immune system is strengthened.

    On a psychological level, the relaxing atmosphere helps to reduce stress and promotes inner peace, which in turn can improve the quality of sleep - ideal for stress and sleep problems. This was shown in a study conducted by Kyushu University in 2023.

    Contraindications: What are the side effects of an onsen bath?

    Despite its numerous positive effects, an onsen bath can also have side effects - especially for people with certain health restrictions.

    The high water temperature can put a strain on the circulation and lead to dizziness or a drop in blood pressure. Caution is therefore advised in the case of cardiovascular diseases such as high blood pressure, cardiac insufficiency or venous thrombosis. The heat can also have unfavorable effects on varicose veins. People with a fever, acute infections or inflammation should also avoid onsen baths.

    In addition, the mineral-rich water can increase the risk of infection spreading to open wounds or infectious skin diseases and cause irritation to sensitive skin.

    As a general rule, anyone suffering from chronic illnesses or acute complaints should seek medical advice before visiting an onsen bath.

    Conclusion

    The most important facts about the onsen bath at a glance

    • 1. Onsen baths are traditional Japanese thermal baths with mineral-rich, geothermally heated water.
    • 2. The bathing culture dates back to the 7th century and is deeply rooted in Japanese tradition.
    • 3. The water contains valuable minerals such as sulphur, iron or radon and can have different therapeutic effects depending on its composition.
    • 4. Among other things, onsen baths promote blood circulation, relax muscles, relieve joint pain, can strengthen the immune system and help to reduce stress.
    • 5. Bathing follows fixed rules, especially with regard to hygiene.

    FAQ - Further questions about the onsen bath

    Where are the best onsen in Japan?

    The three most famous onsen are Kusatsu Onsen in Gunma, Arima Onsen in Kobe and Gero Onsen in Gifu. Other famous resort towns are the Beppu Onsen in Kyūshū and the Dōgo Onsen in Matsuyama on Shikoku.

    What clothes should I wear in an onsen?

    Swimwear is not permitted in most onsen. Guests are often given a yukata (a light version of a kimono) to wear in the facility or on the way to the bath. A small towel can also be used to cover up until the bath.

    How much does it cost to enter an onsen in Japan?

    Admission prices vary depending on the onsen and region, but are usually between 500 and 2,000 yen (approx. 3-12 euros).

    What is the difference between onsen and ryokan?

    An onsen is a hot spring bath with mineral-rich water, while a ryokan is a traditional Japanese accommodation. Many ryokans offer their own onsen baths for their guests, but there are also public onsen that operate independently of accommodation.

    Sources

    • https://www.japandigest.de/kulturerbe/brauch/brauch/sento-onsen-badehaeuser/
    • https://www.japan-experience.com/de/plan-your-trip/japanwissen/travelling-in-japan-a-comprehensive-guide/onsen-in-japan-ein-fuehrer-zu-natuerlichen-heissen-quellen-und-entspannung
    • https://www.japan.travel/de/de/guide/onsen-guide/
    • https://www.wellnessurlaub.com/lexikon/onsen-bad/
    • https://oryoki.de/blog/onsen-baden-auf-die-japanische-art
    • https://smile4travel.de/travel-stories/regeln-japanisches-onsen/
    • https://www.sciencedirect.com/science/article/pii/S2405844023068391
    • https://www.fitreisen.de/studien/hydrotherapie/studie-zu-balneotherapie-bei-chronischen-rueckenschmerzen/

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