Ulcerative colitis (UC) is a type of inflammatory bowel disease that causes inflammation and bleeding from the lining of the rectum and colon (large intestine). This study will assess the change in disease activity of risankizumab treatment in adult participants with moderate to severe UC in real-world clinical practice.

Risankizumab is an approved drug for treating participants with ulcerative colitis. Approximately 200 participants who are prescribed risankizumab by their physician in accordance with local label will be enrolled in approximately multiple sites across Germany and Austria.

Participants will receive risankizumab as prescribed by their physician according to their routine clinical practice and local label. Participants will be followed for up to 52 weeks.

There is expected to be no additional burden for participants in this trial. Participants will attend regular visits during the study at a hospital or clinic according to their routine clinical practice.

Inclusion Criteria:

• Participants with an endoscopically confirmed diagnosis of moderate to severe ulcerative colitis.
• Participants initiating risankizumab at the investigator's discretion as part of their routine clinical care; the decision to administer risankizumab must be made prior to and independent of documentation for the study and according to the approved local label.

Exclusion Criteria:

• Participants previously exposed risankizumab
• Participants who are currently participating in interventional research (not including noninterventional studies, post-marketing observational study (PMOS), or registry participation).

Adult participants with moderate to severe ulcerative colitis being treated with risankizumab.