Postoperative complications associated with anaesthesia present significant challenges to patient outcomes, contributing to morbidity in approximately 20% of surgical cases. Understanding these complications, assessing patient-specific risks, and implementing evidence-based preventive strategies are critical to improving perioperative care. This paper explores common postoperative issues such as fever, cerebrovascular accidents (strokes), nausea, vomiting, bowel obstruction (ileus), and urinary retention, detailing their causes, prevention, and management. It also examines anaesthesia-specific complications arising from airway manipulation, vascular access, patient positioning, and peripheral nerve blocks. Injuries such as dental trauma, airway damage, oesophageal perforation, vascular complications, nerve injuries, and ocular trauma are discussed with an emphasis on early identification and intervention. Additionally, the paper addresses systemic issues including hypothermia, respiratory complications like laryngospasm and bronchospasm, and the rare but serious risk of postoperative vision loss. Through a comprehensive review, this work underscores the importance of vigilance, adherence to safety protocols, and proactive management in mitigating anaesthesia-related risks and enhancing surgical recovery.