Traditional Chinese medicine contends that everything in the universe, including our health, is connected and, thus, our physical bodies are both a part of, and connected to, nature. Not surprisingly, TCM incorporates chinese concepts such as the five elements of nature (wood, fire, earth, metal, and water) and the concept of Yin-Yang.
In the clinical application of traditional chinese medicine, these concepts are applied to syndrome differentiation. How did the ancient Chinese formulate the elementals and yin-yang? They developed them by observing nature's own cycles and changes.