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Recall in the autumn of the Guiwei year, I was in Yanjing (Beijing), when an epidemic broke out on a large scale. Patients presented with slight fullness in the chest and abdomen, and white fur like sheep's wool grew on their tongues. Thousands died daily, and no one knew what disease it was. Li Jun, a Juren (provincial graduate) from Haichang, observed this and said, "This is Sha syndrome." Treatment involved pricking with needles to release blood, after which the illness healed immediately. Consequently, thousands were carried into the city seeking medical attention each day, all recovering and leaving. Shortly thereafter, the symptoms changed to coughing. The cough was mild, yet patients died within half a day. At that time, Li Jun had already left the capital. Those who understood remarked, "This is also Sha syndrome." Using the previous pricking method, they also recovered immediately. I witnessed these events personally. Upon returning home, I discussed them with those knowledgeable in medicine, resulting in equal shares of skepticism and belief. Before long, the needle-pricking method for Sha became prevalent in my hometown. Previously, locals suffering from Sha induced by filth used scraping with oil-dipped coins or objects; at this time, however, pricking was mostly used. Nevertheless, this practice was mainly performed by women, so renowned physicians did not mention it. Consulting medical texts, there were no ancient discussions on this condition. Later authors mentioned "green veins" but remained brief and unclear, leading to few believers and many skeptics. Prescriptions for medication were thus set aside. Unfortunately, those contracting this illness rarely survived. Alas! This is truly pitiable. My friend, Mr. Guo Mingli (courtesy name You Tao), while studying, extensively searched medical literature. Seeing the increasing number of Sha cases and the lack of methods for treating stasis, he pondered deeply, tracing the principles back to childhood exanthematous diseases (Sha zhen), and consulted ancient prescriptions. He found many ancient texts that did not explicitly mention "Sha" but contained the intent of treating it. These methods proved effective in various rescue attempts without failure, strengthening his confidence. He then vowed to spread this knowledge to the world and future generations to save millions of lives, authoring the book *Yu Heng*. Mr. You Tao's dedication was profound, and his merit great! Mr. You Tao once stated, "Sha has no fixed pulse; any pulse inconsistent with the presenting symptoms indicates Sha. Sha has no fixed symptoms; whether caused by wind, food stagnation, fatigue, or phlegm, if standard treatments fail, it is Sha." He established formulas for adherence, recorded efficacies for trust, and concluded with drug properties to clarify appropriate and inappropriate uses, distinguishing it from other diseases. The methods for treating Sha are comprehensively presented in this book. Readers will use this text to treat Sha and address cases beyond Mr. You Tao's scope. His aspirations are thereby fulfilled. Although he may wish to avoid credit, where else would the merit lie? Having witnessed Sha incidents and believing in Mr. You Tao's theories, I dare to write this preface, though these words may not be suitable for the ignorant. Written by Wang Ting, a fellow townsman, on the Double Ninth Festival of the Yimao year, 14th Year of Kangxi.