This document discusses post-operative complications from surgery. It identifies that the type of surgery, patient factors like preexisting conditions, and procedure-related issues can influence complications. Immediate complications include bleeding, airway problems, low oxygen, heart issues, and reduced urine output. Early complications are fever, pain, and nausea/vomiting. Delayed complications include infection. The document then examines specific complications like hemorrhage, damage to nearby structures, pain, low urine output, fever, infections, blood clots, heart problems, reduced bowel function, delirium, and pressure sores.