Case Presentation: A 77-year-old female with breast cancer on capecitabine (Xeloda) initiated 3 weeks ago presented with mouth pain and diarrhea for the last 10 days. She denied any fevers, sick contacts, or recent antibiotic use. Her last dose of capecitabine was 1 week prior. On arrival, she was hypotensive and tachycardic; physical exam was [...]