Inclusion Criteria:  18 years of age or older; with or without history of preoperative abdominal pain American Society of Anesthesiologists physical status (ASA) 1-4 Scheduled surgery: open CRS-HIPEC surgery for primary peritoneal malignancy or secondary carcinomatosis (i.e., appendiceal, colorectal and gastric cancers) Written informed consent  Exclusion Criteria:  ASA >= 4 or emergency surgeries Patients with extra-abdominal metastatic disease Patients cognitive or neurologically unable to complete questionnaires preoperatively Non-English-speaking patients Pregnant women