The biggest symptom of colon cancer can vary from person to person, but one of the most common and significant symptoms is a change in bowel habits, particularly persistent diarrhea or constipation. Other common symptoms may include rectal bleeding, blood in the stool, abdominal pain or discomfort, unexplained weight loss, fatigue, and a feeling of incomplete bowel emptying. It’s essential to consult a healthcare provider if you experience any concerning symptoms, especially if they persist or worsen. Early detection and treatment are crucial for improving outcomes in colon cancer.