This educational video delves into the critical importance of early detection of upper gastrointestinal (GI) cancer. It provides a comprehensive overview of the subtle endoscopic signs that may indicate the presence of early-stage malignancies in the oesophagus, stomach, and colon. Through detailed visual examples and expert commentary, endoscopists will gain valuable insights into refining their diagnostic acumen, ultimately improving patient outcomes. The video emphasizes the significance of vigilance and precision in endoscopic examinations, equipping medical professionals with the knowledge to identify cancerous lesions at their inception.