Chinese Herbal Medicine is one of the great herbal systems of the world, with an unbroken tradition going back to the 3rd century BC. Yet throughout its history it has continually developed in response to changing clinical conditions, and has been sustained by research into every aspect of its use. This process continues today with the development of modern medical diagnostic techniques and knowledge. Because of its systematic approach and clinical effectiveness it has for centuries had a very great influence on the theory and practice of medicine in the East, and more recently has grown rapidly in popularity in the West. It still forms a major part of healthcare provision in China, and is provided in state hospitals alongside western medicine. Chinese medicine includes all oriental traditions emerging from Southeast Asia that have their origins in China.