Issues surrounding the Huiyin-vessel and CV1 (Huiyin)

In order to address conflicting accounts of the Huiyin-vessel and CV1 (Huiyin) in the Wang Bing version of "Huang-di nei-jing Su Wen", we analyzed the origins of the Huiyin-vessel based on its relationship to hemorrhoids in ancient sources on the topic. Furthermore, by considering the curing methods used by health scholars during the Warring States period in China and hemorrhoid treatments until the Song dynasty, we demonstrated the specificity of the posterior yin (anus) and identified the reason behind moving the location of the Huiyin-vessel. We also clarified the way of determining the location of CV1 (Huiyin) and factors that have until now caused confusion related to CV1 (Huiyin).