There are many benefits of soaking in a hot spring, but it is not suitable for soaking in a hot spring when you have a fever. Soaking in a hot spring will intensify the rise in body temperature, thus achieving the effect of sweating, which will speed up the body’s metabolism and eliminate toxins from the body. However, when you have a fever, increased sweating can lead to dehydration, and the viruses and bacteria in your body will not be excreted along with the sweat. It is possible that after soaking in a hot spring, you may feel much more comfortable at once, but afterwards you may feel that your condition has worsened. Moreover, the place where you soak in the hot spring is not thoroughly disinfected, and when you have a fever, your resistance will be reduced, and viruses and bacteria will take advantage of the opportunity to enter your body and aggravate the fever. Therefore, it is best not to take a hot spring bath when you have a fever.