With the increase of high-fat, high-protein and low-fiber food intake and the prevalence of “modern” lifestyles such as less exercise, the incidence of colorectal cancer is on the rise. In China, the clinical diagnosis rate of early-stage colorectal cancer always hovers at 10%-15%. More than 80% of patients are diagnosed in the middle and late stages. In fact, if colorectal cancer can be detected and treated early, the 5-year survival rate after surgery can reach 90%-95%. Therefore, it is very important to carry out early investigation and treatment of colorectal cancer. The early symptoms of colorectal cancer are easily misdiagnosed as hemorrhoids and enteritis, and the early symptoms of gastrointestinal cancer are very hidden. In fact, it usually takes 3-12 months from the appearance of discomfort to the diagnosis of colon cancer, and almost all patients have the experience of being diagnosed as hemorrhoids, enteritis, ascariasis or gastric disease by themselves or doctors in the early stage. Due to the high metabolism, cancer cells divide more quickly, making the trend of colorectal cancer patients younger and more malignant than the middle-aged and elderly. The low rate of early diagnosis of colorectal cancer is closely related to the following factors: on the one hand, patients do not pay enough attention to themselves. On the other hand, some patients lack relevant medical knowledge, self-diagnosis, self-medication, self-treatment based on experience; and doctors are often handled by experience, too lazy to do rectal examination or colonoscopy, delaying the disease. Of course, there are also patients who are afraid of trouble, money and pain of doing colonoscopy, which results in not only spending more money but also suffering more. 2. Chemotherapy for colorectal cancer, the earlier the hope, the greater the hope Chemotherapy is one of the most effective treatments to save and prolong patients’ lives, and it is also the only systemic treatment. After surgical removal of tumor, usually adjuvant chemotherapy is used. Because surgery does not always remove the tumor completely, this leaves chemotherapy to prevent recurrence somewhere in the body. In addition, chemotherapy is the only effective treatment for patients with intermediate to advanced cancer that cannot be treated with surgery or radiation. In recent years, the addition of targeted therapy is more effective.