The most common colon cancer symptoms 1. stools suddenly become very thin; 2. blood in stools; 3. sudden constipation, diarrhea, or a feeling of not being able to poop cleanly; 4. sudden abdominal bloating, a feeling of fullness, or cramping; 5. severe weight loss without weight loss; fatigue, and lack of energy. Who are the people at risk? One is older people. over 90% of colorectal cancers are acquired by people over 50 years of age. Second, people who have a history of bowel polyps or colon cancer. Third, people who have had inflammatory bowel disease. For example, people who have had ulcerative colitis, or Crohn’s disease. Four, people who have two familial genetic disorders: a familial adenomatous polyposis and a hereditary nonpolyposis colorectal cancer. Fifth, people whose family members have had colorectal cancer or colon polyps. In addition, some bad lifestyles such as smoking, drinking and lack of exercise can raise the risk of colorectal cancer. And too high a proportion of red meat (pork, beef, lamb, etc.) in food, too much consumption of processed meat (ham, lunch meat, etc.), or too little dietary fiber are also closely related to the development of colorectal cancer.