Colonic lesions are pathological changes that occur in the colon area, and there are many types of lesions and complex clinical manifestations. The clinical symptoms vary according to the disease: 1, colon polyps: the clinical symptoms are generally not obvious, individual patients may have abdominal pain, occasional indigestion, blood in the stool and other symptoms; 2, acute bacterial dysentery: mostly occurs in the summer and autumn, the onset of the disease is urgent, generally accompanied by fever, pus and blood stool, increased number of stools and other symptoms; 3, amoebic enteropathy: the disease is generally slow onset, increased number of bowel movements accompanied by pain in the lower abdomen. Stool is mostly jam-like and has a fishy smell of corruption; 4. Inflammatory bowel disease: typical symptoms are bloody diarrhea, pus and blood stools, often accompanied by lower abdominal pressure, fever, anemia, hypoproteinemia and other symptoms; 5. Colon cancer: early symptoms are not obvious, continue to develop, the patient significantly lose weight, extreme wasting, visible blood stools, there will be abdominal pain, abdominal distension. Poor mental status, often feeling tired.