Hot springs in Japan are a popular attraction due to their therapeutic benefits, but many people wonder if they have an odor. Hot springs are formed when water is heated underground by geothermal activity, often causing minerals to dissolve in the water, including sulfur, which is responsible for the distinctive smell associated with many hot springs in Japan. However, despite its strong odor, sulfur has many therapeutic benefits and has been used for centuries to treat various ailments. Hot springs in Japan also contain other minerals such as calcium, magnesium, and sodium that provide unique benefits. Visitors are expected to follow etiquette rules and sustainability efforts are necessary to maintain the delicate balance of water flow and temperature required for hot springs' preservation.