When colon cancer is found again 10 years after rectal cancer surgery, it may be caused by recurrence of rectal cancer and metastasis to the colon, or it may be caused by newborn colon cancer. If rectal cancer is found again 10 years after rectal cancer surgery, it is considered to be the recurrence of rectal cancer, because rectal cancer has a certain risk of recurrence after treatment. If the patient’s rectal cancer recurs and has malignant metastasis and metastasizes to the colon, it will lead to colon cancer in the patient 10 years after rectal cancer surgery. In addition, if the rectal cancer patient develops colon cancer 10 years after surgery, it may be due to the fact that the patient has not adjusted the living and dietary habits after surgery, or the patient has adenomatous polyps in the body, etc., which may also lead to the development of colon cancer 10 years after surgery. When rectal cancer patients find colon cancer 10 years after surgery, they should go to hospital in time to clarify their condition and take the best treatment measures under the guidance of professional doctors. It is suggested that patients should develop healthy living habits and also improve their dietary structure to avoid aggravating the condition and affecting the survival period after surgery. Follow the doctor’s instruction for regular review.