Pathogen incubation theory includes "no manifestation after infection" and "manifestation after incubation". Clinical data showed that the incidence and recurrence of tic disorders in children had a strong relevance to six exogenous factors. The pathogenesis is similar to the pathogenic mechanism based on incubation of pathogen theory, so we proposed a theory of "tic disorder induced by incubation of pathogen". Pathogenic wind can be classified into exterior wind and endogenous wind. Pathogenic wind is more apt to move, rise and migrate. The characteristics of pathogenic wind, especially easy mobility, determine the symptoms and signs of tic disorder, for pathogenic wind can be characterized by vibration and involuntary movement such as convulsion and tremor. If exogenous pathogenic wind moves into half-exterior and half-interior phase from the exterior, both the exterior and interior syndromes should be treated at the same time. We should regulate the function of the liver and the lung, expel pathogenic wind by dispersing the lung, and calm endogenous wind by removing obstruction in the collaterals and soothing the liver.

Key words: pathogens, tic disorders, child