Experts say, there is a part of rectal cancer may be caused by genetic factors, but the most fundamental is the diet. Now, a lot of young people in the office at a sedentary lack of exercise, leading to the weakening of the intestinal peristalsis, the harmful ingredients in the colon and stimulate the intestinal mucosa; young office workers to eat fast food, diet is too simple, high calorie and lack of cellulose, which increase the risk of colon cancer. Worthy of attention is that for rectal cancer in the early period of the disease and no obvious specific symptoms, common symptoms of hemorrhoids and are the same as the blood in the stool, a lot of young people mistakenly think that anal bleeding, blood in the stool is hemorrhoids, resulting in a lot of rectal cancer to be diagnosed is already late. Bowel habits change to be alert to colon cancer No specific symptoms of early colorectal cancer. After its development, the main performance is the number of defecation, diarrhea, constipation, anemia, loss of appetite, blood, pus or mucus in the stool. Abdominal pain is one of the early symptoms, often positioning inaccurate persistent pain, or is only the feeling of abdominal discomfort or bloating, bowel obstruction, bellyacke aggravate or clonic angina. Meaning is frequent, change in bowel habits, before the anus have straining feeling, tenesmus, endless defecate feeling; stool surface with blood and mucus, even stool with pus and blood. A population of such symptoms as early as possible go to the hospital for regular check, usually need to do a digital rectal exam, is the most commonly used the most simple inspection method, and colonoscopy is the "gold standard" for the diagnosis of colorectal cancer. Therefore, the general population at the age of 40 began to do recommend colonoscopy. And for individuals at high risk for familial polyposis, genetic factors, from Teens began regular colonoscopy. Eat more fruits and vegetables to promote excretion The cause of the disease of the colon cancer, a part of the colorectal polyps associated with hereditary, a part of the diet with the current has a great relationship. High fat, high calorie, high protein, are the factors that lead to colorectal cancer, but also the main cause of polyps. Experts said that if the lack of dietary fiber intake of dietary fiber, easily lead to constipation, so that the long time in the feces of carcinogens to stimulate the intestinal wall. Therefore, prevention of rectal cancer, develop the habit of defecation prevention constipation is very important. Changing the eating habits, enriching the food type. In order to body sake, workers or eat less fast food is wonderful, as far as possible, eat more food containing cellulose, such as green vegetables, celery, grains and so on. Usually eat fruit, bananas, apples, pears and other exchange to eat, to the stomach a freshness, can promote gastrointestinal peristalsis. Constipation, get up to get up early to drink a cup of 250 ml of water, drink a cup of 250 ml of salt water for the second half. Salt water can smoothly reach the colon, promote defecation.