5岁男孩，面色苍白半年人院，间有脐周痛，家住农村，贫血貌。心率108次/分,律齐，心尖部闻及2/6级收缩期杂音，腹软，肝右肋下0.5cm,RBC4.1x1012/L,Hb85g/L,WBC8.5x109/L,N0.5,L0.41,E0.09,RC0.02,MCV65fl,大便潜血（+)。引起本例贫血的原因是

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