Ulcerative colitis(UC)is characterized by recurrent abdominal pain,diarrhea,and purulent bloody stool.The clinical occurrence of UC for the first time in pregency is rare.However,if diagnosis and treatment are not timely,it will seriously affect the health of pregnant women and fetuses,and even endanger the lives of both mother and baby.This article provides a detailed description of the diagnosis and treatment process of patients with active UC during pregnancy,and combines literature to provide clinicians with experiential reference for improving the diagnosis and treatment techniques of pregnancy with UC.