Qi

Qi (also spelled “chi”) is the essential concept in Chinese medicine.

Qi is a form of energy that exists both inside and outside the human body. For example, common terms describing human physiology, such as blood qi, defending qi, organ qi, meridian qi, nutritional qi, and that describing pathogenic energy from outside, such as qi for wind, dampness, heat, cold, and dryness, reflect that qi is the energy behind every aspect or function of ourselves or the universe around us.