便血即大便中有血液。最常见的原因是消化道疾病,但是全身性疾病尤其血液系统的疾病也可以引起便血,即全身性疾病在消化道也有病变,所以,判断便血的原因时,要想得广一些。发现便血,首先要分析是上消化道出血还是下消化道出血。因为在病因没有弄明白之前,首先要止血,但上、下消化道止血的措施是有区别的。区别的要点从大便的性状上鉴别。看大便的性状还有助于区别引起出血的疾病。所以,家长应仔细观察,必要时留下大便的一部分或全部,让医生观察,挑选大便进行化验。有时大便次数多的,要进行动态的观察,这些信息有助于医生对疾病的诊断。便血不会单独发生,一定有伴随的症状,例如腹痛、腹泻、呕血、发热等等,再加上引起疾病的年龄特点。把以上众多的因素一起进行分析,可以初步 Blood in the stool is blood in the stool. The most common cause is digestive diseases, but systemic diseases, especially hematological diseases, can also cause blood in the stool. That is, systemic diseases are also found in the digestive tract. Therefore, the reason for judging the blood in the stool should be much broader. Found that hematochezia, we must first analyze the upper gastrointestinal bleeding or lower gastrointestinal bleeding. Because of the etiology did not understand before, we must first stop bleeding, but upper and lower gastrointestinal bleeding measures are different. Differentiate the main points from the stool to identify. Looking at the traits of stools also helps to distinguish between the diseases that cause bleeding. Therefore, parents should carefully observe, if necessary, leave part or all of the stool for the doctor to observe, select stool for laboratory tests. Sometimes stool frequency and more dynamic observation, the information helps doctors diagnose the disease. Blood in the stool does not occur alone, and must be accompanied by symptoms such as abdominal pain, diarrhea, hematemesis, fever, etc., plus age characteristics that cause the disease. To analyze many of the above factors can be preliminary