Symptoms and causes of rectal cancer?

summary

Rectal cancer is formed by malignant transformation of rectal tissue cells. The incidence rate incidence rate of incidence of rectal cancer is increasing year by year with the improvement of quality of life. The incidence rate of colorectal cancer (colon cancer + rectal cancer) is third (the top two are lung cancer and gastric cancer). The incidence of colorectal cancer may exceed the incidence rate of lung cancer and gastric cancer in 2015, ranking number one. Therefore, the research on the diagnosis and treatment of rectal cancer is very important. Symptoms and causes of rectal cancer? Let's talk about it.

Symptoms and causes of rectal cancer?

1、 Dietary factors: the so-called Western diet with high fat, high protein and low cellulose is considered to be related to the occurrence of rectal cancer. The incidence rate of colorectal cancer is high in western countries. The incidence of rectal cancer in South Africa is low. The incidence rate of these residents increased with the change of diet structure when they migrated to the high incidence area of rectal cancer. Because high fat and high protein food can increase the content of methylcholanthrene in feces, which can increase the secretion of cholic acid and be decomposed into unsaturated polyunsaturated hydrocarbons by intestinal anaerobes. The decrease of cellulose also slows down the speed of feces passing through the intestine, increases the contact time between these carcinogens and the intestinal conjunctiva, and increases the chance of canceration.

2、 Adenoma canceration: neoplastic polyp can be cancerous, adenoma can be divided into three types: tubular adenoma, villous adenoma and mixed adenoma. The incidence of tubular adenoma and villous adenoma is high. There are hereditary familial adenomas in adenomas, which are regarded as precancerous lesions. They usually develop after 30 years old, but there are also cancerous changes before 20 years old.

3、 Genetic factors: in the families of rectal cancer patients, many have a family history of cancer, and there are also many digestive tract tumors. Due to changes in the genes of normal cells, the patients with cancer get a kind of susceptibility by heredity. In addition, some stimulating factors make the tissue cells grow rapidly, and they will develop into cancer, A family history of malignant cells with genetic characteristics.

matters needing attention

1、 Reduce the intake of fat in the diet. The relationship between diet and cancer, which is the most studied is fat, including saturated fat and unsaturated fat. The fat in the diet can promote the growth of cancer cells, but also can make normal cells early mutation, and evolved into tumors. No matter animal fat or vegetable fat, it should be reduced as much as possible. Excessive fat, especially animal fat, can stimulate bile acid secretion in the small intestine. When the amount of intestinal bile acid is too high, it is easy to become carcinogens and help the growth of cancer cells. Thus, the high-fat diet is closely related to the occurrence of rectal cancer. 2、 Increase dietary fiber intake. Dietary fiber intake can reduce the incidence rate of colorectal cancer, probably because the absorption of dietary cellulose is strong, which can increase the volume of feces, make stool shape, facilitate defecation, reduce the concentration of carcinogenic substances in the intestine, thereby reducing the risk of colorectal cancer. Therefore, on the premise of maintaining the same amount of staple food, some coarse grains should be used to replace fine grains, such as konjac, soybean and their products. 3、 Take vitamins and trace elements. The role of vitamins and trace elements can not be ignored. Eat more fresh vegetables and fruits to supplement carotene and vitamin C. Appropriate consumption of walnuts, peanuts, dairy products, seafood, etc. to supplement vitamin E. Pay attention to the intake of malt, fish, mushrooms and other food rich in trace element selenium.