Upper gastrointestinal perforation is most commonly due to gastric perforation caused by gastric ulcers and is considered an emergency in clinical settings. Following the perforation, the contents of the stomach leak into the abdominal cavity, causing diffuse peritonitis and potentially leading to shock; urgent perforation repair surgery is required. If the perforation is caused by a large ulcer, a major part of the stomach may be removed to prevent recurrence of the ulcer. After surgery, it is important to enhance fluid support. If there is a significant peritonitis, timely use of antibiotics is necessary. Post-surgery, it is crucial to rest, focus on dietary adjustments, eat more vegetables and fruits, and consume fewer spicy and greasy foods. (Medication should be taken under the guidance of a doctor.)