Concept Cough is one of the major symptoms of the lungs.Its eausative factors may be exogenous or endogenous.Exogenous factors include wind cold and wind heat which attack the lung and prevent it from performing its function of dispersing and descending.Endogenous factors include disorders of the lung itself and disorders of other Zangfu organs affecting the lung. Concept • Cough is one of the major symptoms of the lungs.Its causative factors may be exogenous or endogenous.Exogenous factors include wind cold and wind heat,which attack the lung and prevent it from performing its function of dispersing and descending.Endogenous factors include disorders of the lung itself and disorders of other Zangfu organs affecting the lung