Vitamin B12 deficiency anaemia due to intestinal disease

Definition

A number of intestinal disorders can also cause vitamin B12 (cobalamin) deficiency. These include severe pancreatic diseases and small bowel diseases such as malabsorption, ileal disease (including tuberculous ileitis, lymphoma, amyloid, long-term survivors of pelvic irradiation), extensive small bowel resection or bypass, gastric surgery/reconstruction for obesity (bariatric surgery) and Crohn's disease. When jejunal blind loops are present, bacterial overgrowth within the loops competes for cobalamin, leading to cobalamin deficiency. Although not as common currently, infestation with the fish tapeworm, Diphyllobothrium latum, was once a classic cause of cobalamin deficiency.

Also indexed as

Nearby in Megaloblastic anaemia due to vitamin B12 deficiency

• 3A01.0Hereditary vitamin B12 deficiency anaemia
• 3A01.1Neonatal vitamin B12 deficiency anaemia
• 3A01.2Vitamin B12 deficiency anaemia due to low intake
• 3A01.3Vitamin B12 deficiency anaemia due to intrinsic factor deficiency
• 3A01.5Drug-induced vitamin B12 deficiency anaemia
• 4B4YOther specified diseases of the immune system
• 4B4ZDiseases of the immune system, unspecified