title: Hook worm caused chronic anemia found during the procedure of acute gastrointestinal bleeding: a case report.
abstract: BACKGROUND
  Upper gastrointestinal bleeding with complicated factors is always difficult to find the primary origin.
  
  
  METHODS
  Here we present a case of a 74-year-old male farmer suffered from acute upper gastrointestinal bleeding caused by gastric ulcer and Mallory-Weiss syndrome and chronic anemia which was at last found caused by hook worm infection.
  
  
  CONCLUSIONS
  It tells us that considering multi-possibility when can not explain the symptom with monophyletism is very important for clinicians.
authors.affiliation: Gastroenterology laboratory, Clinic Medical Research Institution, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310016, PR China. jianmin_si@zju.edu.cn.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Liangjing
authors.initials: L
authors.lastname: Wang
authors.forename: Jianmin
authors.initials: J
authors.lastname: Si