In TCM, according to its clinical manifestations, lung cancer belongs to the categories of "ka xue" (hemoptysis), "fei ji" (lung mass), "xi ben" (hypochondrium lumps), "xu lao" (consumptive disease), etc. The exopathic factors are the six exogenous pathogenic factors that invade the lung. The endopathic ones include weak constitution, smoking and drinking, dust, emotional upset and overstrain. The main pathogenesis involves deficiency of anti-pathogenic factors with accumulation of phlegm and blood stasis in the lung. Generally, this disease is characterized by principal deficiency and secondary excess. The excess refers to qi accumulation, blood stasis, phlegm, dampness and toxic fire in the lung locally, and the deficiency denotes disorder of the whole body involving qi, blood, yin and yang.