Colorectal cancer has become the third malignant tumor in the world in terms of incidence rate, and data show that the incidence rate of colon cancer in China has nearly doubled in ten years, while the proportion of young people under 30 years old accounts for 15% of the patients. Are more and more young people getting rectal cancer? Colorectal cancer is a typical disease of affluence, which is closely related to our living conditions and diet. Colorectal cancer in young people is mainly influenced by genetic factors, followed by environmental factors. People with familial colonic polyadenomatosis, colon polyps, soft tissue tumors and bone tumors are at high risk of colorectal cancer. People who often eat high-fat and high-heat food, have irregular life, smoke and drink, and stay up late are much more likely to have colorectal cancer. The most common clinical symptoms of rectal cancer 1.Symptoms of intestinal obstruction: mostly occurs in the late stage of rectal cancer, which is caused by cancer blocking intestinal cavity. It often appears as low-level incomplete obstruction first, which is manifested as abdominal distension and constipation, abdominal distension and pain or paroxysmal colic, and when it develops into complete intestinal obstruction, the symptoms intensify. Left-sided colorectal cancer can sometimes have acute complete colorectal obstruction as the first symptom. 2.Abdominal mass: rectal cancer masses are hard, of different sizes, with nodular surface, which can generally be pushed and fixed in later stages, and can have pressure pain when combined with secondary infection. The masses of cecum, ascending colon and colon cancer are located in the lower right, middle right and upper right abdomen respectively. The abdominal masses suggest larger polyp type cancer or metastasis to surrounding organs. 3. Systemic manifestations: there may be systemic manifestations such as anemia, emaciation, weakness and low fever, which are caused by cancer consumption, blood loss due to cancer ulceration, as well as infection and toxin absorption. At the late stage of rectal cancer, cachexia and corresponding symptoms due to local or systemic metastasis of intestinal cancer may appear. Usually, left-sided colorectal cancer is obvious by symptoms of intestinal obstruction, constipation, diarrhea, bloody stool and mucus-blood stool, while right-sided colorectal cancer is obvious by full negative swallowing symptoms such as anemia and emaciation, as well as abdominal masses. What are the symptoms that young people should be alert to colorectal cancer? 1. Change of stool habit: regular shape of stool is a manifestation of one’s intestinal health. Sudden thinning of stool, grooves in stool and mucus are all signs of abnormal intestinal tract. 2, repeated blood in the stool: irregular diet and living of young people will also appear blood in the stool, most of them will self-diagnose as hemorrhoids, too shy to go to the hospital. After a week of medication, if there is still bleeding, or if the symptoms recur after the medication has improved, you must go to the hospital in time. 3, abdominal pain and abdominal mass: abdominal pain is often easy to be ignored by young people, most of them will choose to wait for its own relief, only when the abdominal pain and bloating is very serious, will go to the hospital, at this time more accompanied by intestinal obstruction, the condition has been delayed. Therefore, those who have recurrent episodes of long-term abdominal pain and bloating, especially when a lump is felt in the right lower abdomen or left lower abdomen, must go to the hospital for examination. 4. Constipation and diarrhea: Most young people have experienced constipation and diarrhea in their lives. If it lasts for a long time and the treatment effect is not good after medication, further examination is needed to exclude the possibility of stomach and intestinal tumors. How to prevent the occurrence of rectal cancer in young people 1. Pay attention to regular living habits and weight control. Avoid staying up all night, otherwise it will affect the timely discharge of toxic substances from the large intestine and cause a high incidence of cancer. 2.Avoid eating high-fat food for a long time, and eat more fiber-containing food to keep the bowel movement smooth. 3.Eat more fresh vegetables, fruits, garlic, tea and other natural cancer suppressing foods, and properly supplement foods containing vitamin A, B12, C, D, E and folic acid.