屈氏韧带以下的消化道(包括空、回肠，结肠与直肠)称下消化道。上述部位的病变引起的出血称便血，即下消化道出血(hemorrhage of lower digestive tract(hematochezia))，表现为血液由肛门排出，或者血液与粪便一同排出，血色多呈...
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