溃疡性结肠炎(ulcerative colitis,UC)是发生在结肠、直肠黏膜的弥漫性炎性病变,病因未明,多数学者认为与遗传、饮食、自身免疫等多种因素有关。本病以欧美多见,近年国内发病率有上升趋势。由于UC的病因与发病机制尚未完全阐明, Ulcerative colitis (UC) is a diffuse inflammatory disease that occurs in the colon and rectal mucosa. The etiology is unknown. Most scholars think it is related to many factors such as genetics, diet, autoimmunity and so on. The disease is more common in Europe and America in recent years, the domestic incidence of an upward trend. As the etiology and pathogenesis of UC have not been fully elucidated,