[The cause of death is currently still ranked first in China. The rankings are as follows: lung cancer, liver cancer, gastric cancer, rectal cancer, esophageal cancer, etc. The incidence of rectal cancer in the world is increasing at a rate of 2% per year, and a survey in Shanghai shows that the incidence of rectal cancer in China is twice the world rate, reaching 4%. So why is the incidence of rectal cancer so high in China? 】
1. Changes in eating habits
Due to the changes in living habits in recent years, overeating and irregular eating, all provide prerequisites for the incidence of rectal cancer.
2. Failure to detect and treat precancerous lesions in time
According to incomplete statistics, 80% of the incidence of rectal cancer is transformed from precancerous lesions. In order to avoid the occurrence of rectal cancer, it is extremely important to recognize and treat precancerous lesions. The main precancerous lesions of rectal cancer are as follows:
Colon polyps: most colon cancers are "transformed" polyps. Colon polyps are neoplasms that protrude into the cavity on the surface of the colon mask. Colon polyps mostly occur in the sigmoid colon and rectum. There are more men than women, and older The higher the incidence, the cancerous rate of colon polyps is related to the type, size, and epithelial dysplasia of the polyps. Various carcinogenic factors include the formation of adenomatous polyps in the intestine, and then cancerous changes, especially adenomas and villi. Papillary adenomas or papillary adenomas have a tendency to become cancerous. It is generally believed that the cancer rate of polyps increases with the size of the polyps. Polyps are less than 0.5 cm, and most of them are benign. The cancer rate is only 0.6%, and the cancer rate is about 6% above 1.0 cm, and the cancer rate above 2.0 cm can reach 20%. , 4.0cm and above are mostly malignant, so once intestinal polyps are found, they should be removed under the microscope in time.
Inflammatory bowel disease: mainly includes chronic colitis, chronic non-specific ulcerative colitis, Crohn’s disease, etc. Inflammatory bowel disease cannot be cured in time, and the intestinal mucosa is stimulated by inflammation for a long time, which can cause the formation of intestinal mucosal polyps, especially bacteria and The interaction of cholic acid increases the cancer rate.
Hemorrhoids, anal fistulas, anal papilloma, anal polyps and other anal diseases: Although hemorrhoids cannot be directly cancerous, many patients and doctors misdiagnose or fail to detect tumors due to hemorrhoids, accounting for more than 50% of rectal cancer patients. Anal fistula has repeated episodes of pus, and the clinically cancerous rate of long-term stimulation for more than ten years has also been reported. Anal papilloma and anal polyps are also a factor of cancer.
Reminder: Anorectal diseases cannot be ignored. If anorectal diseases are found, they should be diagnosed and treated in a regular public hospital in time, especially the precancerous lesions indicated above.