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This book is abbreviated as Chao's Disease Causes, also known as Chao's Disease Zhubing Yuanhou Lun , A Summary of Causes and Symptoms of Various Diseases. During the Daye period of the Sui Dynasty, Dr. Chao Yuan-fang, the imperial physician of the Sui Dynasty, was ordered to compile it together with Wu Jingxian and others. It was written in the sixth year of Sui Dynasty (610). The book consists of fifty volumes and sixty-seven chapters. This book is my country's first medical theory work compiled by the imperial court and collectively written. The earliest extant version of this book is the Yuan Dynasty edition, and the most common version is the photocopy of the People's Medical Publishing House in 1955.

Zhubing Yuanhou Lun provides a detailed explanation of the causes, pathogenesis, and lesions of 1,739 syndromes. The collection of diseases and syndromes is unprecedented, and the pathological analysis of the causes and symptoms of each disease is also of a high level. The book is based on diseases. Under each type of disease, the concepts, causes, pathogenesis and syndromes of various diseases are described separately, including: internal disease, five sense organs diseases, surgery, traumatology diseases, as well as skin, anorectal diseases. ; Including gynecology, obstetrics, and pediatric diseases. The discussion is detailed on the causes and syndromes, involving prevention, health preservation, conduction exercise, external treatment and some surgical techniques, and basically contains no prescriptions.

This book has made many contributions to the motherland's medicine and developed previous theories on etiology and pathology. For example, gall disease in mountainous areas is caused by drinking iodine-deficient "sand water". Detailed observations and systematic and accurate descriptions of the lesions and outcomes of various diseases highlight the unique syndromes of each disease, and are useful in clinical differential diagnosis. There's important meaning.

In terms of syndrome classification, the diseases and syndromes before the Sui Dynasty were recorded in detail, classified into categories, and systematized. The book also covers abdominal surgery. Such as: intestinal anastomosis, wound suturing, blood vessel ligation and hemostasis, etc., reflecting the high level of surgical operations in ancient my country.

Zhubing Yuanhou Lun quoted and preserved many precious medical materials in ancient my country. Later generations of doctors highly recommended this book, and it also had a certain influence on foreign medicine. It is the first monograph on etiology and symptomology in my country and has high academic value.