An NP is assessing an older adult patient with lower abdominal pain accompanied by fever. Which of the following conditions may be associated with these assessment findings?

Ischemic colitis occurs when blood supply to a segment of the colon is compromised, leading to ischemia and subsequent inflammation. It classically presents in older adults with lower abdominal pain, often on the left side, accompanied by fever and sometimes bloody diarrhea. Because older adults frequently have underlying atherosclerosis, low-flow states, or vascular disease, they are particularly susceptible to colonic ischemia. The combination of lower abdominal pain and fever in this population makes ischemic colitis a high-priority diagnosis to consider. Hemorrhoids are vascular structures in the anal canal that typically cause painless rectal bleeding, itching, or discomfort during defecation but do not generally produce fever or significant abdominal pain. Colon cancer may cause lower abdominal pain and, if obstructing or perforating, could produce fever, but this would represent a complication rather than the typical presenting picture, and colon cancer more often presents insidiously with changes in bowel habits or occult blood loss. Adenomatous polyps are generally asymptomatic and discovered incidentally on screening colonoscopy without causing fever or acute pain. Therefore, ischemic colitis best explains the combination of lower abdominal pain and fever in an older adult patient.