A 70-year-old man presented with progressive abdominal pain. On examination, he was found to be dehydrated, febrile, and had generalized abdominal pain with guarding and rebound tenderness. He underwent an appendectomy 10 years prior. After rehydration, an exploratory laparotomy revealed a perforated ulcer between the terminal ileum and cecum, causing peritonitis. A limited right hemicolectomy was performed to remove the diseased area. The patient's next steps included monitoring for complications, antibiotic treatment, and a post-operative diet.