LIU Qiquan believes that post-infectious cough is mainly caused by six climatic exopathogens

especially by wind pathogen. The location of the disease is lung

and the main 4 pathogenesis of the diseases are: qi（the lung fails diffusion and descent）

heat（stagnated heat accumulated in the lung）

deficiency（qi-yin depletion and deficiency）

and stasis（stasis obstructing the lung collateral）. It has preliminary stage

medium stage

and lag phase in clinical practice

and it is treated mainly by strengthening vital qi to eliminate pathogenic factor. According to different stages

we should flexibly use the methods of ventilating lung qi and eliminating pathogenic factor

removing stagnated heat

boosting qi and nourishing yin

invigorating blood circulation and unblocking collaterals

and paying attention to securing the spleen and stomach at the same time.