It is believed that Lord Dhanvantari received this science from Lord Brahma, who classified it in eight branches that deal with various medicinal systems. These branches are: Kaya Chikitsa (General Medicine) Shalya Tantra (Surgery) Visha Tantra (Toxicology and preventive medicines) Vajikaranam (Aphrodisiac / Eugenics Treatment) Shalakya Tantra (E.N.T. and Ophthalmology) Kumar Bhrutya Tantra (Pediatrics) Graha Chikitsa or Daivavyapashrya (Spirituology / Psychiatry) Rasayana (Geriatrics and Rejuvenation therapy) This way, Ayurveda is a complete treatment of physical, mental and spiritual well-being. This kind of medical treatment involves use of natural elements like tree bark, leaves, milk, curd, medicated oil, herbal powder, herbal pastes etc., which do not have any kind of side effects. Any treatment is applied to a person on the basis of his/her nature, age, body system and the severity of the disorder. An Ayurveda tour to Kerala is best in monsoon, when our body has less heat and the pores on our skin are open..
Source:
http://www.articlesbase.com/travel-articles/kerala-ayurveda-refined-age-old-healing-1685349.html