This paper provides a comprehensive overview of YU Chang's treatment of deficiency disease,a prevalent chronic illness in ancient China,as outlined in the"Xulao Men"of YU's classical work,Principles for Medicine.In addition to the traditional"five kinds of consumptive disease and seven kinds of damage",YU Chang further categorized the causes of deficiency into"disease damage"and"drug damage".Regarding diagnosis,YU Chang adhered to classical principles,placing significant emphasis on internal organ assessment and differentiation between various types of exhaustion.He also followed ZHANG Zhongjing's approach by highlighting the importance of pulse diagnosis and stressing the need to distinguish between deficiency and excess.Furthermore,YU Chang in-troduced the"Daqi Theory"and the"Autumn Dryness Theory",applying them to disease treatment.Additionally,he established a set of prohibitions at the conclusion of his chapter to prevent future misdiagnosis and mistreatment.In terms of clinical treatment,YU Chang emphasized gradual adjustment rather than relying solely on supplementa-tion.He paid special attention to regulating spleen and kidney function by initially focusing on stomach and spleen regulation to support metabolic processes before gradually supplementing kidney for consolidating the basis.His treatment approach encompassed addressing qi,blood,yang,and body fluids.With regards to medication usage,YU Chang drew from an extensive range of prescriptions while emphasizing pill and ointment administration with gradual dosage increments over several days before integrating dietary therapy for gradual restoration of normal qi.YU Chang strictly adhered to his predecessors'teachings while seeking innovation;he emphasized standardized diagnosis and treatment methods that hold significant reference value for modern clinical practice.
Principles for Medicinetreatment based on differentiationdeficiencygradual adjustingspleen and kidneypaying attention to both pills and ointmentYU Chang