Often asymptomatic; this is why screening for colorectal cancer is so important. When symptoms occur, they include:-
• New onset of abdominal pain
• Bleeding from the rectum
• Blood in or on the stool
• A change in stool caliber or shape
• A change in typical bowel habits, constipation, diarrhea
• Weakness, anemia, weight loss, palpable mass, obstruction
• Jaundice.