In the process of keeping in clear water, due to the difference of everyone's health status, sometimes there will be some uncomfortable feelings and symptoms, usually including the feeling of chills on the second to third day after keeping in clear water. This is because when the human body is in clean water, because there is no food intake, it will start to burn fat, unlike the commonly used carbohydrate (glycogen), which can quickly bring heat to the body, so sometimes chills occur. Therefore, it is suggested that you should keep warm during hydrotherapy, or choose a warm place for hydrotherapy, or in the tropical south, the effect will be better. Sometimes a cold is not warm, so you can keep warm and keep it in clear water, or you can keep it in clear water after the cold is cured.