Taking a steam bath regularly helps boost your immune system. An artificial fever is induced as the body temperature rises high. This rise in body temperature destroys most bacteria and viruses in the body, and it stimulates the immune system to mobilise its own forces. If a steam bath is taken at the onset of a cold, it helps ward off potential flu. However, it will not cure a cold, although it provides relief and opens up the nasal passage. At 106 degrees pneumococcus, a bacterium responsible for pneumonia, dies.