If one day, you suddenly find yourself with a change in the regularity of your bowel movements, or a qualitative change in your stool. Then you should find a time to go to the hospital for examination as soon as possible. Many people think that the stomach and intestines do not hurt and never feel discomfort, must we labor to go to the hospital for examination? The sudden appearance of blood in stool and constipation can be signs of colon cancer. The human colon consists of three parts, namely, cecum, colon and rectum, with a total length of about 1.5 meters, and the colon is divided into ascending colon, transverse colon, descending colon and sigmoid colon. Colon cancer is the general term 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, and early detection is the only way to curb the increasing incidence of colorectal cancer. The number of bowel movements per day determines our health, and some gastrointestinal signals can always determine your health or not. Rectal cancer is most prominent in the change of bowel habits, including the time of bowel movement, frequency and shape of stool strips. Due to the stimulation of cancer, patients with rectal cancer will have more frequent bowel movements, not many bowel movements or even no bowel movements, but only some mucus and blood, accompanied by the feeling of incomplete bowel movements. The change of bowel habit of colon cancer patients is not as obvious as that of rectal cancer patients. However, constipation is one of the more common symptoms of colon cancer patients. Some patients may have diarrhea after constipation, or alternate between constipation and diarrhea repeatedly, or have only dry stools at the beginning and thinning at the end. In some patients, diarrhea is the first symptom, and the number of bowel movements per day increases, which may be mucus-blooded stools, mucus-purulent stools, or loose, thin stools, and may be accompanied by a feeling of urgency. If constipation, diarrhea and other intestinal disorders often occur without other reasons (including travel, change of living environment and taking hyoscine, etc.), and regular treatment is still ineffective for more than two weeks, it should be noted that it may be an early sign of colorectal cancer. 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 of stool as the tumor appears and grows. In particular, the appearance of pus and mucus stool, almost all anal tumor bleeding, stool examination is not just blood stool, but pus cells and mucus mixed in stool is the most common manifestation. Why there is a change of bowel movement in colorectal cancer Many people will have the question: 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 that the cause can be identified and treated actively. Rectal cancer generally occurs in people over 40 years old, but in recent years there has been a trend towards younger patients, even in their 20s. Therefore, good dietary habits and regular health checkups from a young age are the key to prevention. The incidence of rectal cancer is mostly related to poor dietary habits, early symptoms are not obvious, prevention is better than treatment, and it is recommended that people aged 20-40 should have gastroscopy once every 3-5 years, while people aged 40 or above should have annual checkup.