For people with blood sugar abnormalities or cardiovascular and cerebrovascular system diseases, fasting bathing is prone to fainting or hypoglycemic reaction, but for the normal population, control the bathing time and water temperature, fasting bathing usually does not have an impact on health. Usually fasting when the body’s blood pressure will be relatively low, hot water bath will promote vasodilation, increase the speed of blood flow, with the blood flow for a short period of time faster, easy to make the blood pressure has a lower performance, which triggered fainting. Hot water bath will accelerate the body’s metabolic rate, rapid consumption of body energy, if fasting bath blood sugar can not be supplemented in a timely manner, it will produce a hypoglycemic reaction, black eyes, body weakness or fainting and so on. It is recommended that when you need to take a bath, you can eat some food in advance to ensure that the physical energy is in a more normal state, to avoid energy reduction and metabolic imbalance and affected. As bathing is mostly in a confined space, if an accident occurs, it is usually difficult to deal with it in time, and bathing on an empty stomach should be avoided as much as possible in life. In addition, the bath also need to pay attention to control the water temperature, keep between 35 and 40 degrees Celsius, should not be too high or too low, and there is a certain degree of ventilation channel, bath time should not exceed 20 minutes.