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直肠出血又称便血(Hematochezia)。临床表现为由肛门排出红色或暗红色血液。根据出血量多少,分为显性出血和倾注性大量出血两类。出血原因以直肠病变如内痔、肛裂、直肠息肉等为最多见;但整段肠道(包括十二指肠)都可有引起直肠出血的病变。因此,直肠出血的病因诊断相当困难。近年来在诊断手段和方法上有了不少发明和发展,然而虽经胃肠道气钡双对比造影、纤维内窥镜检查、选择性动脉造影等项检查,仍有3～27％的病例病因不明。
Rectal bleeding is also called hematochezia. The clinical manifestation is the discharge of red or dark red blood from the anus. According to the amount of bleeding, divided into two types of dominant bleeding and pour massive bleeding. Causes of bleeding are rectal lesions such as internal hemorrhoids, anal fissures, and rectal polyps; however, the entire bowel (including the duodenum) can have lesions that cause rectal bleeding. Therefore, the etiological diagnosis of rectal bleeding is quite difficult. In recent years, there have been many inventions and developments in diagnostic methods and methods. However, despite the double-contrast angiography of the gastrointestinal tract, fiberoptic endoscopy, and selective angiography, there are still 3 to 27% of cases. The cause is unknown.