The causes of rectal cancer are very complicated, and the treatment of rectal cancer mainly relies on reducing the chance of cancer and early detection of patients. What is the genetic probability of rectal cancer? According to medical research, rectal cancer is a polygenic genetic disease and its occurrence is mainly related to environmental factors and genetic factors. Family history is the most direct manifestation of genetic factors, and the risk of cancer is closely related to family history. What is the probability of rectal cancer inheritance? Seventy to eighty percent of colorectal cancers do not have a clear genetic background, which is called sporadic colorectal cancer, and the remaining twenty to thirty percent have a family history of colorectal cancer, which has a tendency to gather in families and is called genetically related colorectal cancer, which is considered by medical research to be a polygenic genetic disease, and its occurrence is mainly related to environmental and genetic factors. Family history is the most direct manifestation of genetic factors, and the risk of cancer is closely related to family history. Moreover, the intensity of risk is related to the number of relatives with colorectal cancer in family history, whether they are first-degree relatives or not, and the age of onset. Specifically: 1. three or more family members have colorectal cancer, two or more of them are from the same generation; 2. at least two similar generations have developed the disease; 3. at least one of them was diagnosed with colorectal cancer before the age of 50. How to prevent rectal cancer? 1, actively prevent and treat rectal polyps, anal fistula, anal fissure, ulcerative colitis and chronic intestinal inflammation; for multiple polyps and papillary polyps, once the diagnosis is clear, early surgery should be removed to reduce the chance of cancer. 2.Diversify diet, develop good eating habits, do not be partial or picky, do not consume high-fat and high-protein diet for a long time, and eat fresh vegetables containing vitamins and fiber regularly, which may play an important role in cancer prevention. 3.Prevent constipation and keep the bowel movement smooth. 4. Pay great attention to the regular cancer prevention census, pay attention to self-examination at any time to improve alertness, and after discovering the “warning signal”, promptly carry out diagnosis and treatment to achieve early detection and early treatment to improve the survival rate of rectal cancer. Once rectal cancer patients find out the disease, they need to go to hospital for treatment, otherwise it will cause many complications later. Patients should have a reasonable diet and eat less greasy and spicy food.