Signs and symptoms of colon cancer you should know: 1. Changes in bowel habits – Persistent diarrhea, constipation, or noticeable changes in stool consistency or shape. 2. Rectal bleeding – Blood in the stool or bleeding from the rectum. 3. Abdominal pain or discomfort – Ongoing cramping, gas, bloating, or abdominal pain. 4. Incomplete bowel movements – Feeling like the bowel doesn’t fully empty after going. 5. Weakness or fatigue – Constant tiredness or low energy without a clear cause. 6. Unex