The main causes of colon cancer are high-fat recipes and insufficient fiber intake, and it usually develops after the age of 40 and is significantly more common in men than women. Early detection of colon cancer symptoms has a very positive significance for its treatment and prognosis, but the early symptoms of colon cancer are not obvious, so it is very easy to be missed or misdiagnosed. Therefore, it is better for middle-aged people to have a colonoscopy once a year, especially when the following symptoms occur, they should be highly alert to colon cancer. What are the symptoms of colon cancer? 1. Change in bowel habit and continuous abdominal pain in recent time, sometimes intermittent, sometimes persistent, often located in the right lower abdomen. Some patients also have gastrointestinal symptoms, such as abdominal distension or vomiting, acid reflux, belching and other symptoms. 2. Changes in stool characteristics, such as thinning, some patients also have pus and blood, increased frequency of defecation, and persistent positive fecal occult blood test. 3. Some patients have blood and mucus in the stool, which can be easily mistaken for hemorrhoid attacks, leading to misdiagnosis, so rectal examination should be done if necessary. 4. Abdominal masses can be palpated. Half of the patients can find abdominal masses, which can generally move with the intestinal wall and can be clearly felt as hard texture when palpated. 5. Wasting symptoms: most patients have unexplained anemia, fever, weakness, weight loss and general swelling for a short time. After knowing the symptoms of colon cancer, how to prevent colon cancer? Three types of food to prevent colon cancer 1. Eat more high-fiber foods People have long noted that high-fiber diet can reduce the prevalence of intestinal cancer. Studies have found that daily intake of more than 35g of fiber can reduce the incidence of colon cancer by 40%. The incidence of rectal cancer in black African residents is very low, and scholars have found that this is closely related to the fact that they mainly eat foods rich in fiber, such as corn and vegetables. Further research found that the lack of fiber in food can reduce the amount of stool and slow down intestinal peristalsis, so the concentration of carcinogenic substances in the intestine increases and the time of carcinogenic substances acting with the mucous membrane of intestinal wall is prolonged, then colon tumors are prone to occur. In the usual diet, we should try to consume more vegetables, fruits and fiber and have a reasonable diet to reduce the occurrence of colorectal cancer. Some studies have shown that supplementation with vitamins A, C and E can convert the excessive proliferation of colonic epithelium in adenoma patients to normal, but the current information does not support the use of antioxidant vitamins to prevent colorectal cancer. Dietary thioether contained in garlic, onions, leeks, and shallots; terpenes contained in citrus; phytol contained in grapes, strawberries, and apples, as well as carrots, diosgenes, and carotenoids contained in watermelon, are thought to inhibit mutations and have anti-cancer effects. Garlic, in particular, has been shown to be the vegetable with the strongest protective effect against distal colon cancer. 2.Vitamin D and calcium Calcium supplementation can not only improve osteoporosis, but also prevent the occurrence of intestinal cancer. This conclusion is not an empty wind, researchers at the Sloan-Kettering Cancer Center in New York have investigated people at high risk of colon and rectal cancer and found that conscious dietary calcium supplementation for 2 to 3 months slows down intestinal cell division and reduces the occurrence of bowel cancer. In this regard, experts point out that calcium can absorb and combine carcinogens such as fatty acids and bile acids in the intestine; calcium also affects cell biochemical reactions and regulates cell growth, thus playing a role in the prevention of intestinal tumors. Furthermore, studies have confirmed that women who consume more than 412 mg of calcium from their diet and at least 800 mg of calcium from calcium supplement products daily have a 46% lower risk of bowel cancer. Therefore, it can be said that the appropriate amount of calcium can, to a certain extent, protect against the occurrence of intestinal cancer. Folic acid is one of the B vitamins. Epidemiology, animal experiments and clinical data all suggest that increasing the intake of folic acid in daily diet and raising serum folate level can reduce the incidence of bowel cancer. Foods rich in folic acid: animal liver and kidney, eggs, beans, yeast, green leafy vegetables, fruits and nuts. The above is the introduction of colon cancer symptoms and how to prevent colon cancer, preventing cancer, starting from diet.