Best onsen for Asthma in Gunma

8 picks ranked from onsen analysis-sheet data (official, verified and free-flowing sources prioritised)

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Yuyado Tokinoniwa Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringVerified
Yuyado Tokinoniwa
湯宿 季の庭
Gunma Kusatsu· わたの湯1Kusatsu Onsen
The Cotton-Wrapped Spring

This rare, naturally gushing source emerges from beneath 'Gensenkaku,' nestled beside Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field). Despite its strong acidity, its waters offer a remarkably soft bathing sensation, akin to being enveloped in silk floss. The milky-white waters, renowned for having Kusatsu's finest 'yunohana' (hot spring minerals), gently embrace the skin, contributing to silky skin and providing a restorative warmth that lingers deep within the body. Known as a 'phantom spring' for its history of disappearing once during the Taisho era, it now offers a profound escape from daily life, inviting deep relaxation and rejuvenation.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
TEMP50.2
KEY MINERALS
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Oyado Konoha Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Oyado Konoha
木の葉
Gunma Kusatsu· わたの湯1Kusatsu Onsen
The Cotton-Wrapped Spring

This rare, naturally gushing source emerges from beneath 'Gensenkaku,' nestled beside Kusatsu Onsen's iconic Yubatake (Kusatsu's central hot-water field). Despite its strong acidity, its waters offer a remarkably soft bathing sensation, akin to being enveloped in silk floss. The milky-white waters, renowned for having Kusatsu's finest 'yunohana' (hot spring minerals), gently embrace the skin, contributing to silky skin and providing a restorative warmth that lingers deep within the body. Known as a 'phantom spring' for its history of disappearing once during the Taisho era, it now offers a profound escape from daily life, inviting deep relaxation and rejuvenation.

Onsen RyokanPrivate Rental Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.1
TEMP50.2
KEY MINERALS
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Kusatsu Onsen Hotel Sakurai Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Kusatsu Onsen Hotel Sakurai
草津温泉 ホテル櫻井
Gunma 草津町· 万代鉱2Kusatsu Onsen
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen RyokanRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
TEMP94.6
KEY MINERALS
43.2 mg/kg
25.1 mg/kg
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Jizō Gensen Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Jizō Gensen
地蔵源泉
Gunma Kusatsu, Agatsuma District· 地蔵の湯(県有)Kusatsu Onsen
Historic Jizou Spring Fragrant with Old Bathwater

Nestled in Kusatsu Onsen, one of Japan's three most renowned hot springs, Jizo-no-yu has been cherished since ancient times, deeply intertwined with Kusatsu's unique `yumomi` (hot water stirring) culture. This powerful spring, known for its invigorating touch, seems to cleanse away physical and mental stagnation. It provides a deep, restorative warmth that penetrates to the core, offering a refreshing sensation akin to rejuvenation after your bath. Jizo-no-yu offers solace to travelers seeking relief from persistent fatigue or skin discomfort, and those desiring an authentic hot spring experience.

Day-use Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
TEMP50.1
KEY MINERALS
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Yubatake Gensen Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Yubatake Gensen
湯畑源泉
Gunma Kusatsu, Agatsuma District· 湯畑Kusatsu Onsen
A renowned hot spring known for strong acidic sulfur

The Yubatake source, an iconic symbol of Kusatsu Onsen, has drawn countless literati, samurai, and commoners since the Edo period. Enveloped by its white steam and the purifying hydrogen sulfide scent, visitors are instantly transported to an extraordinary realm. This powerfully acidic water, with a pH of around 2, remarkably tightens the skin, offering a refreshing sensation akin to rejuvenation. It promises profound satisfaction for those seeking silky skin, deep relaxation from daily stress, and authentic hot spring experiences.

Day-use Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.02
TEMP52.3
KEY MINERALS
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Rabisuta Kusatsuhiruzu Acidic Spring
Acidic SpringChloride SpringSulphate SpringSulphur SpringInfo pending
Rabisuta Kusatsuhiruzu
ラビスタ草津ヒルズ(共立リゾート)
Gunma Kusatsu· 万代鉱2
Scalding Strong Acidic Spring

The Mandaiko source, originating from traces of past mining development, is deeply intertwined with Kusatsu Onsen's unique yumomi culture and its long history of toji (therapeutic bathing). Its highly acidic waters, among Japan's most potent, deliver a distinctive tingling sensation, awakening both mind and body and offering a sense of rejuvenation. The high-temperature blessings penetrate deep into the core, leaving you with a surprisingly light and refreshed feeling after your bath. We invite those seeking a genuine toji experience, a true escape from daily life to restore their mind and body, to discover the profound power of this spring.

Onsen RyokanPrivate Rental BathRoom with Open-air Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic1.75
TEMP94.6
KEY MINERALS
43.2 mg/kg
25.1 mg/kg
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Nikawa Gensen Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Nikawa Gensen
煮川源泉
Gunma Kusatsu, Agatsuma District· 煮川源泉Kusatsu Onsen
Strong acid famous hot spring - Niiikawa water

The Nikawa Source, cherished since ancient times in Kusatsu Onsen, one of Japan's Three Great Hot Springs, lives up to its name, "Nikawa" (boiling river), with intensely bubbling waters. It features a tingling sensation on the skin and a distinctive sulfur aroma. The bracingly hot waters permeate the body and mind, melting away stiffness. After bathing, expect remarkably refreshed skin and a feeling of lightness. It offers rejuvenation from chronic fatigue and deep relaxation from daily stress.

Day-use Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2.06
TEMP48.8
KEY MINERALS
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Shirahata Gensen Sulphur Spring
Sulphur SpringAcidic SpringChloride SpringSulphate SpringInfo pending
Shirahata Gensen
白旗源泉
Gunma 草津町· 白旗源泉Kusatsu Onsen
Shirahata-no-yu of Kusatsu

Shirahatage Genzen, located in Kusatsu Onsen and adjacent to Yubatake (Kusatsu's central hot-water field), is said to have been discovered by Minamoto no Yoritomo. Historically, it served as the stage for 'Jikan-yu' (timed bathing), supporting balneotherapy culture, and is truly considered the soul of Kusatsu. Its distinctive aroma and powerful waters, which feel as though they firm the skin, seem to awaken the mind and body from within. Surrendering to its embrace offers a pure moment to shed daily clamor and rediscover one's true self. This spring is a sanctuary for those seeking a fresh start and rejuvenation.

Day-use Bath
StimulationBactericidalSkin BeautyHeat RetentionRelaxation
pHStrongly Acidic2
TEMP51.9
KEY MINERALS
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PRIncludes affiliate links

Why onsen are considered good for Asthma

The benefits of an onsen vary by spring type. Certain spring types are traditionally considered good for Asthma, and the corresponding indications are listed in the legally required onsen analysis sheets. my Onsen Techo ranks the onsen best suited to your symptom and area based on analysis-sheet data, which is mandated for display under Article 18 of Japan's Hot Spring Act. Each onsen page shows mineral visualisations, bathing tips and booking options.