Gastrointestinal (GI) diseases presenting with iron deficiency
| Occult GI blood loss |
| Common |
| NSAID use |
| Colonic cancer/polyp |
| Gastric cancer |
| Angiodysplasia |
| Crohn's disease |
| Ulcerative colitis |
| Uncommon |
| Oesophagitis1-151 |
| Peptic ulcer1-151 |
| Oesophageal cancer |
| Water melon stomach |
| Intestinal telangiectasia |
| Lymphoma, leiomyoma and other small bowel tumours |
| Duodenal polyp (Brunner's gland adenoma) |
| Carcinoma of the ampulla of Vater |
| Meckel's diverticulum |
| Hookworm |
| Malabsorption |
| Coeliac disease |
| Gastrectomy (partial and total) and gastric atrophy |
| Gut resection or bypass |
| Bacterial overgrowth |
| Whipple's disease |
| Lymphangiectasia |
↵1-151 Although common causes of acute bleeding they are uncommon causes of occult bleeding.