Hot Spring Water Quality Guide You Should Know | How to Choose by Symptoms

Japan is one of the world's leading hot spring nations, with approximately 3,000 hot spring locations registered with the Ministry of the Environment. However, many people surprisingly think that "all hot springs are the same." In fact, hot spring water qualities are classified into 10 types, each with different characteristics and benefits. For those suffering from stiff shoulders, those troubled by sensitivity to cold, those wanting to beautify their skin—by choosing hot springs according to your purpose, you can better experience their benefits. In this article, we will introduce in detail the characteristics of major water qualities and how to choose them by symptoms.

Learn the Basics of Water Quality—10 Types of Hot Spring Classification

Hot spring water qualities are broadly classified into 10 types based on their contained components. The five most commonly encountered types are simple springs, chloride springs, hydrogen carbonate springs, sulfate springs, and sulfur springs. Simple springs have mild components with little irritation, making them safe for hot spring beginners, elderly people, and small children. They are also the most common type found at hot spring locations nationwide. Chloride springs contain components similar to seawater, and since a salt film remains on the skin after bathing, they have high heat retention effects and are also called "hot water springs." Hydrogen carbonate springs have a cleansing effect that removes old dead skin cells, making them known as "beauty springs." Sulfate springs have properties that help wound recovery and are sometimes called "healing springs." Sulfur springs are characterized by their distinctive smell and excel in blood circulation promotion and sterilization effects. Just understanding the characteristics of these five types will dramatically improve the accuracy of your hot spring selection.

Choose Blood Circulation Promoting Types for Stiff Shoulders and Back Pain

For modern people who do a lot of desk work, stiff shoulders and back pain are serious concerns. Water qualities with blood circulation promoting effects are effective for these symptoms. The most recommended are chloride springs. Salt creates a thin film on the skin surface, making it difficult for body temperature to drop after bathing, so blood flow improvement continues for a long time. The recommended bathing time is 10-15 minutes per session. Water that is too hot can actually cause muscle tension, so the key is to soak slowly in lukewarm temperatures of 38-40 degrees. Sulfur springs also have blood vessel dilating effects and are effective for chronic stiff shoulders. However, since sulfur springs have strong irritation, limit bathing to 2-3 times per day. Carbon dioxide springs (carbonated springs) should not be overlooked either. Carbon dioxide gas absorbed through the skin dilates capillaries, achieving high blood circulation promotion effects even at relatively low temperatures. Since they place little burden on the heart, they are also called "heart springs" and are recommended for people with high blood pressure.

Hot Spring Bathing Methods Effective for Sensitivity to Cold

For those troubled by sensitivity to cold, it's important to choose water qualities with high heat retention effects. In addition to the aforementioned chloride springs, sulfate springs are also effective for improving sensitivity to cold. There are also key points in bathing methods. First, accustom your body to the hot spring with preliminary rinsing before bathing. Start by soaking in lukewarm water (37-39 degrees) for about 5 minutes, get out and rest, then soak in slightly hotter water (40-42 degrees) for about 10 minutes—this "alternating bath" method is effective for sensitivity to cold. Once you feel warmed to your fingertips and toes, finish in lukewarm water. After bathing, promptly dry your body to avoid cooling down, and put on socks to maintain warmth. To maximize the effects of hot springs, regular bathing is more important than single sessions. Ideally, you could visit hot springs 1-2 times per week, but for those in distant areas, using hot spring bath salts for foot baths at home is one method. When visiting hot spring areas, the "toji" (hot spring cure) style of soaking leisurely for 2 nights and 3 days or more will likely provide the most noticeable effects.

Choose These Water Qualities for Beauty Effects

The beauty effects of hot springs work very differently depending on the water quality. The most famous "beauty springs" are hydrogen carbonate springs. Weakly alkaline components gently dissolve sebum and old dead skin cells, leaving skin smooth after bathing. Alkaline simple springs with pH values of 7.5 or higher have similar cleansing effects, and since they have less irritation, they are suitable for people with sensitive skin. Meanwhile, sulfate springs are said to help collagen production and can be expected to give skin firmness. Acidic springs have strong sterilization power and are suitable for those concerned about acne and rough skin, but since they have strong irritation, avoid long baths and lightly rinse with fresh water after bathing. For beauty purposes, the basic approach is not to rinse off with a shower after bathing, leaving the hot spring components on your skin. However, this doesn't apply to highly acidic water qualities or sulfur springs. Finding a water quality that matches your skin type is the shortcut to hot spring beauty.

Practical Techniques for Choosing Hot Springs

Here are practical techniques for finding hot springs that match your purpose. First, check the "hot spring analysis certificate" that is always posted at hot spring facilities. It lists the water quality name, pH value, and total component amount, and reading this will tell you the characteristics of that hot spring. If the total component amount is 1,000mg/kg or more, it can be considered a relatively concentrated hot spring. When making travel plans, check the water quality in advance on the hot spring area's official website and judge whether it matches your purpose. Day-trip bathing fees are generally 500-1,500 yen, and it's reassuring to check in advance about towel rentals (200-300 yen) and amenity availability. When bathing, avoid times when hungry or full, and it's best to allow at least one hour before and after meals. Absolutely avoid bathing after drinking alcohol. The recommended number of daily baths is up to 3 times, with 15-20 minutes per session being appropriate.

Hot springs are a natural blessing that Japan can proudly share with the world. Just having knowledge of water qualities will surprisingly change your satisfaction with hot spring trips. SOROU features healthcare spot information from all over Japan, so please find hot springs that perfectly match your physical condition and purpose. Let's make more use of Japan's hot spring culture for mental and physical refreshment.