Colorectal cancer is a malignant tumor that grows in the colon, and its incidence is increasing year by year with the improvement of living standard and change of diet structure. Most colorectal cancers do not have any symptoms in the early stage, so when the patient feels very healthy, the cancer may have progressed silently for several years. 6 early signs of colon cancer Early colorectal cancer may have no obvious symptoms, and the following symptoms may appear only after the disease has progressed to a certain degree: 1. Change in bowel habits Right hemicolectomy is characterized by early thin stool, pus and blood, increased number of bowel movements, alternating diarrhea and constipation; while left hemicolectomy is characterized by difficulty in defecation, which will continue to worsen with the development of the disease. 2.Changes in stool characteristics: thin stool, bloody stool, mucus stool, etc. 3.Gastrointestinal symptoms: abdominal distension, discomfort or indigestion-like symptoms. In the case of right hemi-colon cancer, it is mostly discomfort or hidden pain in the right lower abdomen, much like chronic appendicitis attack. 4.Abdominal masses About 50% of patients can find abdominal masses, which are cancer masses or masses infiltrated and bonded with omentum and surrounding tissues, hard and irregular in shape, and the masses can be fixed in advanced stage colon cancer because the cancer is more infiltrated. In right hemicolectomy, the bleeding is small and fully mixed with feces due to peristaltic movement of colon, so it is not easy to be seen by the naked eye, but the occult blood test is often positive; while in left hemicolectomy, the bleeding and mucus are not mixed with feces, and about 1/4 patients can observe blood and mucus in feces by the naked eye. 6.Anemia and systemic symptoms such as emaciation, weakness and hypothermia.