The goal of this clinical trial is to assess the effectiveness and safety of non-dressing (exposed wound) versus dressing techniques in postoperative wound management for patients with gastrointestinal tumors. The main questions it aims to answer are: 1. Does non-dressing of postoperative wounds in gastrointestinal tumor surgery provide equivalent or better wound healing compared to traditional dressing techniques? 2. Can non-dressing of postoperative wounds reduce patient pain and healthcare costs? Participants in this study, who are diagnosed with gastrointestinal tumors and undergoing surgery, will be randomly assigned to either the non-dressing group or the dressing group. The non-dressing group will have their surgical wounds left exposed after initial postoperative care, while the dressing group will receive regular wound dressing changes every 48-72 hours. Researchers will compare these two groups to see if there are differences in the rate of wound complications, pain levels, and overall healthcare costs. This study aims to provide evidence-based recommendations for postoperative wound care in gastrointestinal tumor surgeries, potentially improving patient outcomes and reducing medical expenses.