Colorectal cancer mainly includes colon cancer, rectal cancer and other diseases, and there is no such thing as 10 initial signs. There are many common symptoms, such as abdominal pain, change of bowel habit, abdominal mass, anemia, blood in stool, change of stool shape and so on. 1. Abdominal pain: most colon cancer patients will have hidden pain in the abdomen, and if there is obstruction, it will be abdominal cramps. 2. Change of bowel habit: colon cancer may cause diarrhea, constipation, increased frequency of bowel movement and other changes in bowel habit; rectal cancer may cause symptoms such as anxiousness and heaviness, anal drooping and unclean bowel movement. 3. anemia: manifested as pale face, yellowish face, dizziness, weakness. 4. Blood in stool: colon cancer patients may lead to blood in stool, mucous bloody stool; rectal cancer may lead to blood on the surface of stool as well as mucous, or pus bloody stool. 5. Change of stool shape: the extrusion of tumor may cause deformation of stool, resulting in thinning of stool, which may cause obstruction in serious cases. Simply from the symptoms can only be suspected to be caused by certain diseases, if there is any discomfort, it is necessary to go to the hospital in time, give the corresponding physical examination and auxiliary examination, etc., after diagnosing the cause of the disease, follow the doctor’s instructions and actively treat it, to avoid delaying the condition.