结直肠癌早期症状易混淆：便血呈暗红粘液便，不同于痔疮鲜血；排便习惯改变，腹泻便秘交替；大便变细或有凹槽，伴腹部包块、消瘦。预防需少食红肉、加工腌制食品，多吃果蔬；40岁以上有息肉或肠癌家族史者，应定期肠镜筛查，切除癌前病变。(赵方园 张静 陈庆洋 张嘉怡）
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