Inflammatory bowel diseases (IBD) are chronic inflammatory disorders of the gastrointestinal system (GIS) that have shown increasing incidence and prevalence over the past two decades. Ulcerative colitis and Crohn's disease are the two primary conditions under the IBD umbrella. These diseases are not confined to the gastrointestinal system but can present with extraintestinal manifestations, including locomotor, dermatologic, and ocular symptoms. To simplify complex clinical scenarios, activity indices have been developed. These indices incorporate individual or combined clinical and endoscopic findings to facilitate the rapid and reliable assessment, treatment planning, and monitoring of patients.