Deficiency anemias in gastrointestinal disease.
D000740:Anemia / Q000209:etiology; D000747:Anemia, Hypochromic / Q000209:etiology*; D006471:Gastrointestinal Hemorrhage / Q000150:complications*; D006801:Humans; D008286:Malabsorption Syndromes / Q000150:complications*