Colorectal cancer is the general name of “colon cancer” and “rectal cancer”, among which rectal cancer is more common, accounting for about 60%. It is also one of the common malignant tumors in China. The diet structure of high fat, high protein and low dietary fiber, coupled with too little exercise, leads to the slowdown of intestinal peristalsis, which easily triggers constipation. Moreover, eating more high-fat food will increase the secretion of bile acids in the intestine, which will stimulate and damage the intestinal mucosa. If the body is in such stimulation and damage for a long time, colon cancer will be easily induced. In addition, obese people are also high-risk groups for colon cancer. Early signs of colorectal cancer Changes in stool habits and traits are obvious early signs of colorectal cancer, which are generally manifested as alternating diarrhea and constipation, blood in stool or black stool, flattening and thinning of stool shape, etc. Why can we know colorectal cancer through bowel movement? Food is digested by the stomach and absorbed by the small intestine, and finally turned into feces and excreted through the colon and rectum, completing the whole process of converting food into energy to support human activities. Therefore, once there is a tumor growing in the lining of the colon or rectum, it will definitely have an effect on the feces to be passed there to make changes. The surface of tumor is different from normal intestinal mucosa, which tends to bleed after rubbing with stool. Therefore, blood in stool is the most typical symptom of early stage of colorectal cancer cancer. As one of the common malignant tumors, colon cancer should be promptly examined by colonoscopy once “dangerous symptoms” are detected, so as to identify the cause and actively treat it. One of the most important characteristics of cancer is that it is difficult to be detected in the early stage, and so is colorectal cancer. Early colorectal cancer is mostly asymptomatic, and only with the increase of tumor and the continuous progress of the disease will colorectal cancer reveal its symptoms. However, as long as we pay close attention, we can understand the emergence of colorectal cancer through some subtle changes in stool during the process of tumor emergence and growth. In particular, the appearance of pus and mucus stool, almost all anal and intestinal tumor bleeding, stool examination is not just blood stool, pus cells and mucus mixed in stool is the most common manifestation. Self-examination of hemorrhoids and bowel cancer As hemorrhoids and rectal cancer are similar in location and both will have bloody stools, blood in the stool of hemorrhoids patients is due to scraping of the affected area during defecation, and most of the blood is dripping down with the discharge of stool, while the stool of rectal cancer patients is often mixed with blood, mucus and thick liquid. Pus and blood stools can often be seen in advanced tumors, sometimes accompanied by foul odor. If you have been suffering from hemorrhoids and blood in stool for many years, you should pay attention and don’t let the small hemorrhoids cover up the rectal cancer. If you touch your finger from the anus and feel some raised grains inside, you have a hemorrhoid. If you feel a cauliflower lump in your intestine or an ulcer with a raised edge and a sunken center, and you find that your intestinal cavity is so narrow that it can only accommodate a finger; after examination, your finger is stained with blood, thick fluid and mucus, you are most likely suffering from rectal cancer.