Rectal cancer is a lifestyle disease with a genetic link. It has now jumped to the second place in the list of cancers. The occurrence of rectal cancer is mainly related to a high-fat, low-fiber diet and inactivity, a diet that is also particularly common among white-collar workers. Many people do not care about not having a bowel movement for one or two days and think it is not a big deal. However, when the stool is knotted in the intestine, it becomes more and more dry and difficult, which damages the intestinal wall over time and leads to the accumulation of toxins and cellular lesions, causing rectal cancer. Since rectal cancer is closely related to diet and exercise, we should prevent it in these two aspects so that it can be turned into a success. In addition, sunlight has a close relationship with the incidence of rectal cancer. The incidence of rectal cancer is also low in the southern United States, which has long sunshine hours. This shows that vitamin D has a positive effect on the prevention of rectal cancer. The amount of vitamin D in the body of white-collar workers who do not see sunlight in office buildings and go out by car is definitely limited. Since there is a lack of vitamin D synthesized by sunlight, is it effective to take in sufficient amount of vitamin D from the diet? There is an opinion that vitamin D in the diet works just as well in the body. However, another opinion is that no matter how much vitamin D is consumed in the diet, it must be present in the sunlight in order to play its proper biochemical role. Many bedridden elderly people take vitamin D orally to prevent osteoporosis, but studies have shown that vitamin D is not absorbed without the involvement of ultraviolet light and without the stimulation of exercise. This shows how important it is for health to have everything that nature has given us. If you are too busy to even absorb nature’s sunlight and fresh air or are not in a position to do so, then something must be wrong with that person’s health. The initial symptom of rectal cancer is blood in the stool. Blood in stool, however, is a complex clinical disease symptom that originates from a variety of diseases. If you find blood in stool, you should have the following common sense: 1. Blood from hemorrhoids is usually bright red, and blood from rectal cancer is usually darker than blood from hemorrhoids; 2. Blood from hemorrhoids is often drop by drop, and blood from rectal cancer is sometimes large; 3. Blood from both hemorrhoids and rectal cancer is first blood and then stool, but sometimes blood and stool from rectal cancer often cross dissolve …… The above are just general situations. Special cases are often more complicated. Anyway, it is easy to seek medical attention in time when you find the symptoms of bloody stool. It is better to do rectal examination, colonoscopy and barium enema imaging to further confirm the diagnosis. Early diagnosis is of great significance. People should not talk about rectal cancer. As long as it is detected early, the cure rate of rectal cancer is quite high. Because rectal cancer is an adenoma, early surgery to remove it is usually not a big problem!