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总结
文章以健康科普形式解读粪便颜色与排便变化可能反映的身体状况，提示黑便、鲜红便或带血便可能与消化道出血相关，灰白便可能提示胆道阻塞或肝胆胰问题，部分异常颜色也可能受饮食、补充剂与药物影响。多家报道同时强调，长期不明原因便秘、排便习惯改变、粪便带血等可能是结直肠癌等严重疾病的早期信号，建议出现持续或加重症状应尽快就医，必要时进行粪便检测与肠镜等检查以排除风险。
正文
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