will not selectively target the tissue to be removed, and can damage all tissue. Whirlpools also create an unwanted risk of bacterial infection, can damage fragile body tissue, and in the case of treating arms and legs, bring risk of complications from edema. History The therapeutic use of water has been recorded in ancient Egyptian, Greek and Roman civilizations. Egyptian royalty bathed with essential oils and flowers, while Romans had communal public baths for their citizens. Hippocrates prescribed bathing in spring water for sickness. Other cultures noted for a long history of hydrotherapy include China and Japan, the latter being centred primarily around Japanese hot springs. Many such histories predate the Roman thermae. Modern revival Hydrotherapy became more prominent following the growth and development of modern medical practices in the 18th and 19th century. As traditional medical practice became increasingly professional in terms of how doctors operated, it was felt that medical treatment became increasingly less personalized, the development of hydrotherapy was believed to be a more personal form of medical treatment that did not necessarily present to patients the alienating scientific language that modern developments of medical treatment entailed. 1700–1810 Two English works on the medical uses of water were published in the 18th century that inaugurated the new fashion for hydrotherapy. One of these was by Sir John Floyer, a physician of Lichfield, who, struck by the remedial use of certain springs by the neighbouring peasantry, investigated the history of cold bathing and published a book on the subject in 1702. The book ran through six editions within a few years and the translation of this book into German was largely drawn upon by Dr J. S. Hahn of Silesia as the basis for his book called On the Healing Virtues of Cold Water, Inwardly and Outwardly Applied, as Proved by Experience, published in 1738. The other work was a 1797 publication by Dr James Currie of Liverpool on the use of hot and cold water in the treatment of fever and other illness, with a fourth edition published in 1805, not long before his death. It was also translated into German by Michaelis (1801) and Hegewisch (1807). It was highly popular and first placed the subject on a scientific basis. Hahn's writings had meanwhile created much enthusiasm among his countrymen, societies having been formed everywhere to promote the medicinal and dietetic use of water; and in 1804