Are tumor markers “cancer indicators”? What should we do if abnormalities are detected?

If a physical examination shows elevated tumor markers, does that mean you have cancer? What should you do if elevated tumor markers are detected? Which groups of people need early cancer screening?

NetEase Health and Peking University People's Hospital have jointly launched the "One Picture to Understand Physical Examination Series" plan for the health co-creation plan. Let's quickly learn about the "unreliable" tumor markers through this issue~