This study includes participants undergoing major hepatic surgery, surgery in the esophagus or stomach, or major surgery on the pancreas performed at Copenhagen University Hospital, Rigshospitalet. The aims of the study 1: To record patients' level of catastrophizing preoperatively and pain perioperatively, and pain treatment, as well as related side effects. Furthermore, to investigate whether it is possible to assign the task of rating pain scores to the patient.
2\. To investigate patients' expectations preoperatively and the fulfillment of these expectations 30 days after, and the development of chronic pain after 6 months. 3. To record patients' pre- and postoperatively rated health and daily quality of recovery during the seven days of admission. Furthermore, patients' symptoms, levels of pain, and use of analgesics will be assessed 30 days and six months after discharge.