Prof. CAI Gan agrees with theories of "internal injury to spleen and stomach leading to many diseases"and "spleen governing four-zang". He holds that

spleen and stomach are the sources of blood and Qi generation and development

as well as the pivot of Qi movements

thus

the spleen and stomach have close relationships with the other four zang. Prof. CAI is good at treating internal injury and miscellaneous diseases. He emphasizes to regulate the five zang with taking care of spleen and stomach as the core

and treat spleen and stomach to calm the five zang. This article introduces CAI Gan’ s experience in treating lung diseases with theory of "spleen governing fourzang". He considers treating spleen and stomach to solve lung diseases. In clinical practice

he often uses therapeutic strategies that strengthening spleen and tonifying lung

strengthening spleen and dispersing phlegm

strengthening spleen and inducing diuresis

nourishing stomach and benefiting lung

as well as prompting spleen and kidney. This article also describes two cases to illustrate the clinical application of his above experiences.