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. What are the early symptoms of colon cancer? 1. Early symptoms of colon cancer can be poisoning symptoms: due to blood loss and toxin absorption of tumor ulceration, patients often appear anemia, low fever, weakness, emaciation and swelling, among which anemia and emaciation are especially important. Early symptoms of colon cancer include abdominal mass in patients with colon cancer: since middle age or above is the stage with the highest incidence of the disease, therefore, patients above middle age should be more alert and consider the possibility of colon cancer when they have the following manifestations 3. There may be abdominal distension, discomfort and indigestion-like symptoms, followed by changes in bowel habits, such as increased frequency of stool, diarrhea or constipation, and abdominal pain before stool. Later on, there may be mucus stool or mucous-purulent blood stool, which is the most early symptom of colon cancer. 4.Intestinal obstruction manifestation: incomplete or complete low-level intestinal obstruction symptoms, such as abdominal distension, abdominal pain (distension or colic), constipation or stool closure. Physical examination shows abdominal rumbling, intestinal shape, localized pressure pain, and hyperactive bowel sounds can be heard.