This is part of a series of lectures on Qin Bowei's 56 methods. The focus of this lecture will be on cold and cold conditions. The lecture will cover the source, causes, mechanism, locations, disease manifestations, and presenting symptoms, providing a broad picture of cold and cold conditions. The associated treatment principles of cold conditions, key diagnostic criteria for each principle, the associated flagship formula for each, how to modify it, how it relates to classical Chinese medicine will also be discussed. The lecture will conclude with numerous case studies to demonstrate how the system can be used clinically.