|Types of Onsen
|Chloride Spring "enka butsusen"
||There are 3 types of Chloride Springs (Salt, Calcium, and Magnesium ). Being an island, Japan has many Salt Chloride Springs. Salt connects with the protein and the fat on the surface of the skin and retains the body temperature.
||Cuts, Burns, Chronic Skin Disease, Chronic Gynecological Disorders, Muscle/Joint Pain etc
|Sodium Bicarbonate Saline Spring "tansan suiso ensen"
||Sodium Bicarbonate is alkaline. It washes off the fat from the surface of the skin and makes the skin smooth, therefore, it is called "water for the beautiful skin". After bathing, water evaporates quickly from the surface of the skin and cools off the body.
|| Cuts, Burns, Chronic Skin Disease, etc
|Sulphate Spring "ryusan sen"
||This spring is known as "water for cuts and bruises". There are three types of springs: Calcium sulphate, Sodium sulphate, and Magnesium sulphate.
||Cuts, Burns, Chronic Skin Disease, Arteriosclerosis, Chronic Constipation(when drunk) etc
|Carbon Dioxide Spring "nisanka tanso ensen"
||The soda water expands the blood vessels and lowers the blood pressure. It also retains body temperature.
|Ferruginous Spring (Iron) "gantetsu sen"
||There are two types of Ferruginous Spring: Carbonated Iron Spring, and Melanterite Spring. As the spring oxidizes, it gets brown. Ferruginous Spring is said to replenish the body's iron levels through the absorption from the skin, and drinking.
||Menstrual disorders, Anemia, etc
|Sulphur Spring "io sen"
||Sulphur spring that contains hydrogen sulfide has a distinct smell of bad eggs. It is said that the vapor containing hydrogen sulfide is good for chronic bronchitis. However, the gas is toxic and proper ventilation is essential. Sulphur spring expands the blood vessels and helps reduce the blood pressure.
||Cuts, Diabetes, Chronic Skin Disease, High Blood Pressure, Joint Pain etc
|Acidic Spring "sansei sen"
||This type of Spring is found in highlands of volcanic countries like Japan. Acidic spring is stimulus and its antibacterial effect is said to be good for the skin, however not recommended for people with sensitive skin. Also, the highlands with acidic spring has been a popular place to visit to develop physical strength.
||Chronic Skin Disease, Chronic Gynecological Disorders etc
|Simple Thermal Spring "tanjun onsen"
||All the hot springs that does not contain enough minerals meet the criteria for specific Onsen are categorized as Simple Thermal Spring. This is the most common type of spring found in Japan.
||A wide range of mild effects