贫血原因一般分为两类,一是营养差、食物中摄取的铁不足所致。二是丢失过多,如消化道溃疡、肿瘤、息肉、痔疮、寄生虫等破坏粘膜及小血管导致慢性失血,这种原因在临床中比较常见。贫血后会感觉疲乏无力、面色苍白、心慌气短、头晕眼花等,中老年人如果出现以上症状,要提高警惕,观察自己是否大便变黑或者像柏油一样,并及时去医院进行血常规、大便潜血检查,如果大便潜血阳性,说明消化道有小血管破裂出血。那么,是什么原因引起的出血呢?此时要高度怀疑 The causes of anemia are generally divided into two categories. One is poor nutrition and is caused by inadequate iron intake in food. The second is too much loss, such as peptic ulcer, tumor, polyps, acne, parasites and other damage to the mucosa and small blood vessels leading to chronic blood loss, this reason is more common in clinical practice. Anemia can feel tired and weak, pale, palpitation, shortness of breath, dizziness, etc., if the above symptoms occur in middle-aged and elderly people, they should be vigilant, observe whether they have black stools or like asphalt, and go to the hospital for blood routine and fecal occult blood. Check, if fecal occult blood positive, indicating that the small blood vessels in the digestive tract bleeding. So what is the cause of bleeding? At this time it is highly doubtful