Colon cancer is a common malignant tumor of the gastrointestinal tract occurring at the junction of the rectum and sigmoid colon, with the highest incidence in the age group of 40 to 50 years old, and the ratio of men to women is 2 to 3:1. The incidence rate is the third highest among gastrointestinal tumors. Colon cancer is mainly adenocarcinoma, mucinous adenocarcinoma and undifferentiated cancer. The general morphology is polyp-like, ulcerated and so on. Colon cancer can develop along the circumference of intestinal wall, spread up and down along the longitudinal path of intestinal tube or infiltrate deeply into the intestinal wall. In addition to metastasis and local invasion via lymphatic vessels and blood stream, it can also spread and metastasize into the abdominal cavity or along the suture and incision surface. Patients with chronic colitis, colon polyps and male obese people are the susceptible groups. Clinical manifestations of right hemicolectomy cancer: 1. abdominal lump: accounting for 79% of the symptoms, the abdominal lump may be caused by the lump itself or by adhesion with the surrounding organs or intestinal tube 2. abdominal pain: accounting for 73% of the symptoms, the tumor invades the muscle layer of the intestinal wall and causes hidden pain. When the tumor penetrates the intestinal wall and causes peri-intestinal inflammation, and adheres to the peritoneum or other organs, the pain will gradually increase. When the tumor penetrates the intestinal wall and causes perforation or secondary infection in the peri-intestinal area, the pressure pain at the abdominal mass is obvious. As the abdominal mass increases, the chance of intestinal obstruction increases. The bleeding of cancer foci ulcer is easy to mix with stool, which is not easily detected by naked eyes, and chronic hemorrhagic anemia appears. Clinical manifestations of left hemicolectomy: 1. Blood in stool: 75%, formed stool rubbing cancer foci, and bleeding from cancer foci ulceration. 2.Mucus in stool: for choriocarcinoma, the amount of mucus is more 3.Intestinal obstruction: the cancer invades the intestinal canal and causes obstruction due to narrowing of the intestinal cavity, which is manifested as abdominal pain, abdominal distension, hyperactive intestinal sounds, and air over water sound; due to the low position of obstruction, vomiting symptoms are not prominent. With intestinal obstruction, it often indicates advanced colon cancer.