5-hydroxytryptamine(5-HT)is a monoamine neurotransmitter,which plays a key role in regulating gastroin-testinal motility,antioxidation and immunomodulation.Inflammatory bowel disease(IBD)is characterized by repetitive epi-sodes of inflammation of the gastrointestinal tract,and its pathogenesis hasn't been illustrated completely.In recent years,the role of 5-HT in the development of IBD has drawn attention gradually.Therefore,this article reviews the advances of 5-HT in the pathogenesis of IBD and focuses on the pathways of autophagy,oxidative stress,inflammatory reaction,endoplasmic reticu-lum stress and gut microbiota through which 5-HT causes IBD,with the hope of providing insights for identifying novel prognos-tic biomarkers and exploring new therapies.