Chinese were one of the early civilizations to have developed religion, writing, and early form of medicine / treatment around 1500 BC. They are also credited with have developed a reasonably evolved understanding of the flow of blood and energy through the entire body based on observation of the anatomical circulatory system. This period of innovation in medicine is attributable to the Shang Dynasty (1766 - 1122 BC). During that time, the Chinese believed that sickness and disease was the result of Upsetting the ancestor gods and being cursed.
Curing the sick then involved getting rid of the curse by performing prayers and rituals to the ancestors. Prayers were also performed to make it rain, pacify volcanoes, and to address famines in the kingdom.
Around the same time, the Chinese and other civilizations in the East developed the theory of Points and Channels of energy, which formed the underlying basis for acupuncture. The theory was based on centuries of observations around:
Once the ancient Chinese recognized these patterns, they started formalizing a practical form of treatment based on pressure points and flow of energy:
Come to think of it, these observations were made about 3,000 years before the Gray's Anatomy was written!!