Identify the early manifestations of colon cancer: 1. Early symptoms: At the earliest stage, there can be abdominal distension, discomfort and indigestion-like symptoms, among which in the case of right hemi-colon cancer, it is mostly abdominal pain and discomfort or hidden pain. The symptoms of early colon cancer can be intermittent at the beginning, and then turn into continuous. The change of stool habit is also one of the symptoms of early colon cancer. When the right half colon cancer is manifested as early thin stool with pus and blood and increased number of bowel movements, alternating diarrhea and constipation may occur when the cancer of colon cancer continues to increase and affects the passage of stool, while the left half colon cancer is mostly manifested as difficulty in defecation, which will continue to worsen with the development of colon cancer. 2.Abdominal mass: It is a mass infiltrated by tumor or omentum and surrounding tissues, with hard texture and irregular shape, and some of them can have certain mobility with intestinal tube. 3.Intestinal obstruction manifestation: incomplete or complete low level intestinal obstruction symptoms, such as abdominal distension, abdominal pain, constipation or stool closure. The common symptoms of colon tumor are abdominal bulge, intestinal shape, local pressure pain, and hyperactive bowel sounds. The lumen of the left half of the colon is relatively small, and the stool is already sticky and shaped by this point, and the part is mostly invasive cancer, and the intestinal lumen is narrowed in a circular manner, so the symptoms of intestinal obstruction appear earlier. 4.Toxic symptoms: It is also one of the clinical manifestations of colon cancer. Due to the blood loss and toxin absorption of colon cancer tumor ulceration, it often leads to anemia, low fever, weakness, emaciation, swelling and other symptoms of colon cancer patients, especially anemia and emaciation. The right hemicolectomy is rich in blood and lymph, with strong absorption ability, and the cancer is mostly soft, easy to ulcerate and necrosis, resulting in bleeding and infection, so the symptoms are mainly toxic. 5.Late symptoms: jaundice, ascites, swelling and other signs of liver metastasis, as well as cachexia, rectal anterior concave mass, enlarged supraclavicular lymph nodes and other signs of distant tumor spread and metastasis.