Hydrotherapy simply refers to water-therapy, and the therapeutic benefits of water on the human body. Hydrotherapy recommendations can range from changing water intake to the application of water to the body. When water is applied to the body, with a variety of temperatures and lengths of exposure, it directly affects our circulatory system by either opening up or narrowing small blood vessels. This has a systemic effect (meaning it affects the entire body system) and can be used to treat a variety of conditions from musculoskeletal complaints to immunological imbalances. These treatments are prescribed for patients to do at home.