Early stage of bowel cancer usually has no obvious symptoms, but when it develops to a certain degree, there will be changes in stool habits and stool traits, and the symptoms are as follows: 1. frequent diarrhea, increased number of stools or changes in stool traits, with blood or mucus, corrupt necrosis-like material; 2. abdominal pain or indefinite hidden pain from time to time; 3. abdominal mass: abdominal mass needs to be distinguished from fecal mass, which usually disappears on the second or third day, while the mass always exists, especially in the transverse colon or sigmoid colon, usually with free degree; 4. intestinal obstruction: generally there are symptoms such as pain, vomiting, abdominal distension and constipation.