Refresh your body and mind in a Japanese onsen
Hot springs, or “onsen” as they are called in Japan, are more than just a relaxing retreat. The mineral-rich, warm waters of onsen are known for their numerous health benefits.
From improving circulation to alleviating muscle and joint pain, these natural waters offer a therapeutic escape from the stresses of daily life.
Table of contents — jump to the section you need
But first of all, let’s start with the basics!
What are hot springs called in Japan?
In Japan, hot springs are known as “onsen.” This term refers not only to the natural hot springs themselves but also to the bathing facilities that have developed around them. Onsens are an integral part of Japanese culture and are cherished for their relaxing and healing properties.
What is the most famous hot spring in Japan?
One of the most famous hot springs in Japan is Beppu Onsen, located in Oita Prefecture on the island of Kyushu. Beppu is renowned for its variety of hot springs and unique experiences, including the famous “Hells of Beppu,” a series of vividly colored and striking hot spring pools.
Are hot springs good for your health?
Yes—hot springs are considered highly beneficial for health. The warm, mineral-rich waters of onsen can help improve circulation, alleviate muscle and joint pain, and promote relaxation. Here are some of the most loved benefits:
- Improved circulation: Heat encourages blood flow and helps the body feel lighter and more energized.
- Skin comfort: Many minerals are associated with soft, refreshed, “just-left-the-onsen” skin.
- Muscle & joint relief: Warm water relaxes tension and soothes stiffness after long days.
- Stress relief: A calm environment + warm water = deep relaxation that can support better sleep.
Why onsen feel so effective: the science behind the calm
Onsen in Oriental Medicine: the power of wellness and preventive care
Onsen are not designed to “treat” specific diseases, but rather to improve overall health and help prevent conditions. Revised therapeutic indications often include issues related to autonomic nervous system imbalance and stress-related disorders (such as insomnia, fatigue, or low mood). In other words, it is recognized that onsen can support mental well-being— offering soothing, relaxing effects that restore balance.
The therapeutic power of baths and onsen
Why are onsen effective? One might think it’s “simply because they contain beneficial components,” but in reality, several factors interact together. This is often described as a complex synergistic effect.
The healing thermal effects of onsen
The fact that the heat of the water warms the body is called the “thermal effect.” This effect supports blood circulation. As the body warms, blood vessels (especially capillaries) dilate, metabolism increases, and the elimination of bodily waste is facilitated. Keeping the body warm is essential to overall comfort.
Hot water (typically over 42°C) stimulates the sympathetic nervous system (more alert/energized), while warm water (around 37–40°C) stimulates the parasympathetic nervous system (more relaxed/calm). Many Japanese people enjoy a hotter bath, but it’s important to be mindful—especially when water is above 42°C.
The benefits of hydrostatic pressure
Hydrostatic pressure on the body’s surface during immersion gently compresses the body, stimulating internal organs in a way that can feel like a natural massage. It also helps venous return (blood flow back toward the heart), supporting circulation and a “lighter” feeling in the legs.
Combined with thermal effects, hydrostatic pressure can also support diuresis (the body’s natural elimination processes), often associated with a refreshed, detox-like sensation after bathing.
Shima Onsen: A timeless hot spring retreat for healing and relaxation
Nestled in the tranquil mountains of Gunma Prefecture, Shima Onsen is a historic hot spring town known for comfort and healing. Often cited among Gunma’s beloved onsen areas (along with Kusatsu and Ikaho), Shima Onsen blends old Japan with deep nature, offering visitors relaxation and a feeling of renewal.
The healing waters of Shima Onsen
A hot spring legacy since 989
Shima Onsen holds a special place in Japanese history. A well-known legend says its waters can heal “40,000 illnesses,” giving the area its name (“Shima” as a poetic reference to 40,000). With abundant mineral-rich water sources, it has attracted visitors for generations.
Types of healing springs
Shima Onsen is known for multiple spring types, including chloride and sulfate springs—each with distinct bathing sensations.
Chloride springs: the heat-retaining bath
Chloride springs are often described as “heat-retaining” because the salt content can reduce evaporation on the skin, helping warmth linger. They are popular for those who feel cold easily and for post-bath comfort.
Sulfate springs: nature’s restorative waters
Sulfate springs can include calcium, sodium, or magnesium sulfate types. They are often associated with comfort for skin and body, and are widely appreciated in onsen culture.
Shima Onsen’s natural beauty
Seasonal beauty of the national park
One of the most unique charms of Shima Onsen is its changing scenery. Visitors enjoy the serene landscape year-round: spring blossoms, vibrant summer greens, dramatic autumn colors, and quiet winter stillness.
A stroll through tradition and nature
After bathing, take time to wander. Waterfalls, streams, and gentle hiking paths invite slow exploration— a perfect complement to a warm soak.
A rich onsen experience for all
Traditional ryokan and modern hotels
Shima Onsen offers a range of stays, from classic ryokan (tatami rooms, futon beds, local cuisine) to modern hotels that blend comfort with heritage.
Drinking the healing waters
In some onsen towns, mineral water is also enjoyed for wellness traditions. As always, visitors with medical conditions should consult a professional before drinking mineral water.
Japanese bathroom accessories for an at-home onsen experience
Bring the ritual home: hinoki wood, calming aromas, and thoughtful details—crafted in Japan for a daily wellness routine.
1) Hinoki Wood Bath Stool
Premium Japanese hinoki for a calm, authentic bathing posture.
https://irasshai.store/products/hinoki-bath-bucket-copper-black- Comfortable, stable seating for mindful bathing
- Hinoki aroma for a spa-like atmosphere
- Japanese craftsmanship designed for humid spaces
2) Hinoki Bath Bucket — Copper Black
Elegant Japanese bathware: wood, water, and ritual in perfect balance.
- Designed for traditional Japanese rinsing rituals
- Hinoki’s refined texture and scent elevate the experience
- A statement piece for premium bathroom décor
3) Hinoki Aroma Shower Soap
Clean, calming, and deeply Japanese—like a forest bath in soap form.
- Hinoki essential oil for a soothing aroma
- Gentle cleansing for everyday comfort
- Perfect to begin your onsen-inspired ritual
4) Cypress Wood Foot Bath
A quiet winter ritual: warm water, wood aroma, and deep release.
- Ideal for cold evenings and tired legs
- Wood warmth + aroma create a spa-like atmosphere
- A beautiful wellness tool for home routines
Explore the Irasshai Bath Collection
Find everything you need to recreate the onsen feeling at home—Japanese bath stools, buckets, soaps, wood accessories, and more.
Conclusion
In conclusion, Japanese hot springs—onsen—offer a unique and deeply enriching experience that goes beyond mere relaxation. Their warm, mineral-rich waters are cherished for supporting circulation, skin comfort, stress relief, and soothing tired muscles. Whether you’re visiting iconic destinations like Beppu or discovering hidden onsen towns like Shima Onsen, the feeling is the same: a return to balance.
And with the right essentials—hinoki wood, calming aromas, and thoughtfully crafted tools—you can bring that ritual home. Slow down, breathe, and let your bath become your winter sanctuary.
