The most common symptoms of colon cancer include blood in the stool, changes in bowel behavior such as diarrhea or constipation, unexplained weight loss, or general fatigue and weakness, according to Mayo Clinic. Many people with early-stage colon cancer experience no symptoms.
Colon cancer is the second leading cause of cancer-related deaths in the United States, says the American Cancer Society. Having a family history of colon cancer is a risk factor for developing the disease, states MedicineNet. Starting at the age of 50, it is recommended that all people undergo regular screening with a colonoscopy for colon cancer, says WebMD.