Rectal cancer is a malignant tumor of the rectum and is not contagious when eating together with a person with rectal cancer. Rectal cancer is a malignant tumor of the rectum, and eating together with rectal cancer patients will not be contagious. Cancer is caused by a combination of genetic changes or external factors, and it is not a contagious disease. Rectal cancer is mainly caused by a combination of dietary changes and genetic factors, which have a great relationship with dietary habits. Eating together, hugging or further contact with each other will not lead to rectal cancer contagion. In addition, rectal cancer is an internal disease, not an infectious disease, so there is no contagious situation.