Colorectal cancer is a common malignant tumor, including colon cancer and rectal cancer. The incidence rate of colorectal cancer is from high to low: rectum, sigmoid colon, cecum, ascending colon, descending colon and transverse colon, and in recent years, there is a tendency to develop to the proximal end (right hemicolectomy). Its incidence is closely related to lifestyle, genetics and colorectal adenoma. The age of incidence tends to be older, and the ratio of men to women is 1.65:1. Are colorectal cancer, colon cancer and rectal cancer the same thing? Colorectal cancer includes colon cancer and rectal cancer. Clinically, the colon is divided into colon and rectum, and colon includes ascending colon, transverse colon, descending colon and sigmoid colon. Cancer can occur in every part of the colon, and the incidence of colorectal cancer is from high to low: rectum, sigmoid colon, cecum, ascending colon, descending colon, and transverse colon. Although colon cancer and rectal cancer belong to the same type of colorectal cancer, there are differences in clinical manifestations and treatment strategies, and they are treated differently in clinical practice. Common manifestations of colorectal cancer Colorectal cancer has no symptoms in the early stage, or the symptoms are not obvious, only discomfort, indigestion and occult blood in stool. As the disease progresses, there may be symptoms such as change of stool habit, abdominal pain, blood in stool, abdominal mass, intestinal obstruction, anemia, fever and emaciation. Generally, the right half of the ascending colon and the right half of the transverse colon are called the right half of the colon, and the left half of the transverse colon and the descending colon are called the left half of the colon. Right hemicolectomy often presents with loss of appetite, nausea, vomiting, anemia, fatigue, abdominal pain, and often with anemia. It is easy to be ignored by both patients and doctors. Left hemi-colon cancer often has symptoms of constipation, blood in stool, diarrhea, abdominal pain, abdominal cramps and bloating, which can easily cause intestinal obstruction. The main symptoms of rectal cancer are blood in stool, change of defecation habit and obstruction. The overall treatment effect of colorectal cancer is relatively good, and stage I, II and III patients often adopt radical resection + regional lymph node dissection to determine the scope of radical resection and its surgical method according to the location of the cancer. It is possible to perform palliative resection to relieve symptoms and improve patients’ quality of life.