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大便带血是怎么回事？
大便带血是很常见的症状，而引起该症状的疾病有很多种，既有痔病、肛裂这样的常见病、良性病，也有结肠癌、直肠癌这样的恶性肿瘤，应当引起足够重视。（出品：科普中国-星空计划）
科普中国 星空计划170/251
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