Water is one of the most important constituent of our body. Water maintains the temperature and keeps our body healthy. Understanding these facts Rishis of India (Indian Saints highly intellectuals) presented the technique of using water internally and externally. This method of using water for maintaining health is known as hydrotherapy. This therapy originated from India and slowly spread throughout the world. Water is one of the five therapeutic agents in naturopathy. Treatment of diseases with the use of water is called hydrotherapy. In this therapy, water is used on the body in the form of enema, baths, packs, sprays and douches. There are two major methods used in hydrotherapy 1. Internal application such as inhalation and enema. 2. External application such as compresses, sprays and baths. In this book water therapy treatment is described step-by step for treatment of common disorders.