• A change in bowel habits
• Diarrhea, constipation, or feeling that the bowel is not completely empty
• Blood (either bright red or very dark) in the stool
• Stools that are narrower than usual
• General abdominal discomfort (frequent gas pains, bloating, fullness, and/or cramps)
• Weight loss with no known reason
• Constant tiredness
• Nausea and vomiting

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