This study is therefore postulated as a clear alternative that evaluates patients´quality of life, and recognises fecal calprotectin as an inflammatory marker. Longitudinal, prospective, multi-center cohort study to measure the impact that the therapeutic attitude (treatment intensification/de-intensification o escalation/de-escalation) has on the quality of life of patients with UC given a colonoscopy revealing mucosal healing (Mayo 0, Mayo 1); considering as treatment intensification/de-intensification a dose increase or decrease on the same line of treatment, and escalation/de-escalation if there is a change to a new line of treatment.