Onsens is the Japanese term referred to hot spring and it has been used as therapeutic bathing site by early historic emperors and many people nowadays. Japanese people take great pleasure in hot spring bathing and it has been a central feature of Japanese tourism as onsen bathing is now considered to be part of Japanese traditional culture.
Onsens have been naturally considered as a healing method for wounds/pains and other ailments, not only by humans but also by animals living in the wild.
The chemical components found within onsens can be absorbed into the body both, by bathing in them or when consumed. There are large number of medicinal effects that are produced from the various types of onsens and these can work comprehensively in your favor in order to bring about positive health and beauty benefits.
*NOTE: It is strongly advised that you do not attempt to bathe in Onsen when afflicted with certain illnesses and/or ailments. Acute illnesses (particularly when accompanied by a fever), tuberculosis, malignant tumours, serious heart diseases/problems, respiratory problems, kidney problems, haemophilia, anaemia, during pregnancy (particularly during the initial and final stages of a pregnancy), and in general any illnesses/conditions that have significantly deteriorated an individuals health, or affected an individual for a considerable period of time.