Colorectal cancer, including colon cancer and rectal cancer, is one of the malignant tumors with the highest incidence rate nowadays, and the incidence rate is higher in the south of China, especially after the economic development, improvement of living standard and change of diet structure, the incidence rate of colorectal cancer has been on the rise for people’s concern. Colorectal cancer is often asymptomatic in the early stage, and when non-specific symptoms such as blood in stool, abdominal pain and diarrhea appear, it is already in the middle and late stage. However, in recent years, it has been found that the proportion of young people younger than 40 years old suffering from colorectal cancer is increasing, especially the proportion of colorectal cancer among young people in China is higher than the relevant foreign data. Coupled with the negligence of young people in examination, the misdiagnosis rate is extremely high, and some of them are even repeatedly misdiagnosed many times, and are misdiagnosed as hemorrhoids, dysentery, colitis and other diseases, which delay the treatment. However, colorectal cancer in young people does have some distinctive features, which are summarized in four points. 1. There are more cancers on the right side. Normal human colon starts from the lower right abdomen (cecum), goes up to the right mid abdomen (ascending colon), turns left to the upper mid abdomen (transverse colon) to the upper left abdomen (descending colon, sigmoid colon) and goes down slightly against the midline (rectum). That is, at the rectum, sigmoid colon and descending colon, accounting for about 70% of the total. In contrast, the number of colorectal cancers located on the right side (i.e., cecum and ascending colon) has increased significantly in young people, such that the lesion rates on the left and right sides are almost equal. The right side of the colon is less fixed, more mobile and has a wider intestinal lumen, so it is not as prone to obstruction as the left side. The activity of the mass is relatively larger, and the left-side colon cancer is more likely to have intestinal obstruction, and the mass is also more fixed. 2.More people have severe abdominal pain. Colorectal cancer infiltrates into the plasma membrane layer. Or inflammation caused by the lesion may lead to intestinal spasm, etc. Patients often have abdominal pain. The abdominal pain of middle-aged and old-aged patients with bowel cancer is lighter or vague, while young patients have more obvious or even severe abdominal pain, which may be related to the reduced pain sensitivity of the elderly. 3. Bloody stools are more common. Although bloody stool is one of the common symptoms in middle-aged and old-aged colorectal cancer patients, bloody stool or mucus stool is more common in young patients, reaching more than 70%, or even bleeding is the first symptom. It is worth noting that because the stool is not fully formed in the right half of the colon, it is often mixed with stool after bleeding. If it is a small amount of bleeding, it can only be detected by occult blood test, and some patients even have obvious anemia and still do not know where the lesion is. There are more fresh blood stools that can be observed by the naked eye in middle-aged and elderly people with colorectal cancer. 4.More infiltrative carcinomas. The so-called infiltration refers to the ability of cancer cells to spread to surrounding or deep tissues. Compared with middle-aged and old-aged colorectal cancer, young people have poorly differentiated cancer cells (immaturity) and strong infiltration ability. It is more likely to spread, so the prognosis is worse and requires early diagnosis and treatment. Qian Wenjuan Li Shan Zhu Jingjing Diet structure and colorectal cancer 90% of colorectal cancer can be prevented and controlled through reasonable diet, therefore, healthy diet is especially important for colorectal cancer prevention. 1.Increase the intake of dietary fiber Foods rich in dietary fiber include celery, leek, cabbage, radish, konjac, soybean and soybean products, algae, especially water-soluble vitamins, and each person needs 500g of vegetables per day. a diet pattern of low fat, high fiber and more fruits and vegetables can reduce the incidence of tumor by 35%. 2. Reduce the intake of high-fat diet High-fat diet is a high risk factor for colorectal cancer. Eat less or no foods rich in saturated fatty acids and cholesterol, such as lard, fatty pork, animal offal, fish roe, squid, egg yolk and coconut oil, etc. Do not eat fried foods or eat less, eat foods containing monounsaturated fatty acids in moderation, and avoid overheating animal food and vegetable oil during cooking. At the same time to increase the intake of calcium. 3, trace elements and vitamins Trace elements and vitamins are essential for maintaining normal life activities, including vitamins A, C, D, E and beta-carotene. These are abundant in all kinds of vegetables and mushroom food. Obesity, especially abdominal obesity and low physical activity, are risk factors for colorectal cancer. Smoking and drinking alcohol are risk factors of colorectal cancer, not eating moldy, barbecued and smoked food, limiting the intake of pickled food and salt also have good preventive effect. Bowel cancer prevention is simple and cheap. About 70% of colorectal cancer (colorectal cancer) is already in the middle and late stage when it is found again, which is difficult to treat and has a low survival rate, and finding early colorectal cancer is the most important way to improve the treatment effect. In fact, it is very simple to prevent colorectal cancer. You only need to do the following two things. 1.Fecal occult blood test once a year; 2.Colonoscopy for those with positive fecal occult blood test.