Colorectal precancerous lesions mainly include colorectal adenoma and inflammatory bowel disease.The traditional Chinese medicine（ TCM） theory of colorectal precancerous lesions was discussed in this paper

and it pointed out that pathogenesis was improper diet

emotional frustration

external evil invasion and inadequate natural endowment

and the basic etiology was spleen qi deficiency

dampness and turbidity stasis toxin blocking the intestinal tract. The main pathological factors were cancer toxin

damp turbidity

and blood stasis

and basic therapeutic principle was strengthening the body resistance to eliminate pathogenic factors

taking the therapy of tonifying qi and invigorating spleen as core and dissipating dampness

removing blood stasis and removing toxicity as integrated treatment. The pathological factors and treatment were different in different types of colorectal precancerous lesions

so the pathological factors and treatment were different. Specifically

the main pathological factor of colorectal adenoma was cancer toxin

accompanied with blood stasis

which was primarily treated with removing blood stasis and eliminating stagnation. The main pathological factor of inflammatory bowel disease was cancer toxin

accompanied with damp turbidity

which was primarily treated with dissipating dampness and dispelling turbidity.