TCM practices include treatments such as herbal medicine, acupuncture, dietary therapy, Tui na and Shiatsu massage; often Qigong and Taiji are also strongly affiliated with TCM.
TCM theory is extremely complex and originated thousands of years ago through meticulous observation of nature, the cosmos, and the human body. Major theories include those of Yin-yang, the Five Phases, the human body Channel system, Zang Fu organ theory, six confirmations, four layers, etc.