Bowel cancer patients’ stools are not contagious. When bowel cancer patients defecate, some stools may have dark red blood or dirty blood attached to the surface. Some patients may also experience changes in stool characteristics, such as thinning of stool sticks or difficulty in defecation or incomplete defecation. Some patients may also have mucus blood on the surface of stool, and the mucus blood may be dark red mucus blood or dirty colored mucus blood. Therefore, the specific stool condition depends on the severity of bowel cancer. Clinically, it is common to perform electronic colonoscopy to clearly understand the condition of bowel cancer and the specific location and degree of bowel cancer. Therefore, stool of bowel cancer patients is not contagious.