Taking the theory of collateral diseases as the starting point

this article explored the internal relations between microcirculation changes in the lung and Chinese medicine theory of collateral diseases in the development process of pulmonary interstitial fibrosis through research on pathological changes of pulmonary interstitial fibrosis.The microcirculation changes in pulmonary interstitial fibrosis is closely related to the view of prolonged diseases involve collaterals in the theory of collateral diseases. The microcirculation changes in pulmonary interstitial fibrosis reflect some viewpoints of blood stasis and deficiency after long-time illness in Chinese medicine collateral diseases theory from modern pathology. The principle of prevention and treatment of pulmonary interstitial fibrosis can be determined from collateral diseases theory.