The goal of this observational retrospective study is to assess the impact of hepatitis B virus (HBV) infection on the clinical course and outcomes of inflammatory bowel disease (IBD) in Egyptian patients. Researchers will compare the IBD extent, location, severity, and behavior between IBD patients with and without HBV infection. Participants will be subjected to history-taking (history of hospital admission and disease flare, surgical history, medication history, follow-up duration, and mortality), clinical examination, laboratory investigations, abdominal ultrasonography, and endoscopic examination.