Prospective Observational Study of Effectiveness and Safety of Filgotinib in Participants With Ulcerative Colitis (UC)

Inclusion Criteria:

1. Filgotinib-naïve participants with moderately or severely active UC as judged by the physician and starting filgotinib treatment according to local treatment guidelines, routine practices and product information.

Exclusion Criteria:

1. Participation in any interventional or non-interventional study without priorapproval from the medical leader. This does not preclude inclusion of participantsenrolled to national registries.

2. Participant is diagnosed with Crohn's disease.