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凡血从肛门排出体外,都可叫便血。但便血的颜色,形态不尽相同,有的呈鲜红色,有的暗红色,有的柏油色;有的是便后滴血,有的与大便、脓、粘液混杂在一起。 便血是下消化道,特别是结肠、直肠或远端小肠出血的特殊症状,但如果上消化道出血量特别多也可以从肛门排出,常见的便血有下列几种: 肛门疾病 痔和肛裂最常见,都是便后滴血,色鲜红,血与大便不混合,病人经常在便纸上发现血迹。所不同的是,肛裂便后可有短时间的剧痛;而内痔一般不痛,并可有痔核脱出,甚至脱肛症状。 直肠疾病 最常见的是直肠癌,可有便秘与腹泻交替发生,持续便血,肛门指检可触及肿块。直肠息肉也常见,发现直肠息肉应手术切除,否则癌变机会较高。
Where blood is excreted from the anus, can be called blood in the stool. However, the color of blood in the stool, different patterns, some were bright red, some dark red, and some asphalt; some will drop after the blood, and some stool, pus, mucus mixed together. Blood in the stool is a special symptom of lower gastrointestinal bleeding, especially in the colon, rectum or distal small intestine. However, if the amount of upper gastrointestinal bleeding is very high, it can also be discharged from the anus. Common blood in the stool is as follows: anal disease hemorrhoids and anal fissure Common, are after the drop of blood, color bright red, blood and stool is not mixed, the patient often found in the toilet paper blood. The difference is that after anal fissure may have a short period of pain; and internal hemorrhoids generally do not hurt, and may hemorrhoids prolapse, or even rectal prolapse symptoms. Rectal disease is the most common rectal cancer, constipation and diarrhea may occur alternately, continuous blood in the stool, anus can refer to palpable mass. Rectal polyps are also common and found that rectal polyps should be surgically removed, otherwise the chance of cancerous higher.