由肛门排出的血液,不管是鲜血,还是与粪便相混的血或柏油便,均称便血。便血为常见的临床症状,反复小量便血可导致贫血,亦可能是某些严重疾病的先兆;量大则可引起休克,危及生命。所以均需迅速查明原因给予治疗。从便出血液的性质,初步可判断出血的部位,因此,如有可能,医生应亲自观察粪便的形态与血液的颜色、量,再结合 Blood excreted by the anus, whether it is blood, or mixed with excrement of blood or tar will, are called blood in the stool. Blood in the stool is a common clinical symptom. Repeated small amount of blood in the stool can cause anemia and may also be a precursor to certain serious diseases. Large amounts can cause shock and endanger life. Therefore, we need to quickly identify the cause of treatment. From the nature of the bleeding out of the blood, initially determine the site of bleeding, so, if possible, the doctor should observe the form of manure and blood color, quantity, and then combined