Vitamin B12 deficiency causes

Vitamin B12 deficiency Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.

Causes

Common Causes

• Insufficient diet
• Malabsorption syndrome
• Gastrectomy
• Gastritis
• Ileal resection
• Postgastrectomy syndrome
• Crohn's disease
• Celiac disease
• Bariatric surgery
• Idiopathic
• Bacterial infection

Causes by Organ System

Cardiovascular	No underlying causes
Chemical/Poisoning	Nitroux oxide abuse
Dental	No underlying causes
Dermatologic	No underlying causes
Drug Side Effect	Cimetidine, Glyburide , Metformin hydrochloride, Neomycin, Omeprazole, Pantoprazole, Prolonged antiacid use, Rabeprazole, Ranitidine hydrochloride, Saxagliptin hydrochloride
Ear Nose Throat	No underlying causes
Endocrine	Graves' disease
Environmental	No underlying causes
Gastroenterologic	Achlorhydria, Atrophic gastritis, Bariatric surgery, Blind loop syndrome, Bothriocephalosis, Celiac disease, Chronic pancreatitis, Cobalamin malabsorption, Crohn's disease, Gastrectomy, Gastritis, Grasbeck-imerslund disease, Ileal resection, Imerslund-najman-grasbeck anemia, Malabsorption syndrome, Pancreatic insufficiency, Pancreatitis, Postgastrectomy syndrome, Small bowel disease
Genetic	Homocystinuria, Mthfr deficiency
Hematologic	Grasbeck-imerslund disease, Imerslund-najman-grasbeck anemia, Intrinsic factor deficiency , Juvenile megaloblastic anemia, Macrocytic anemia, Megaloblastic anemia, Pernicious anemia, Transcobalamin deficiency
Iatrogenic	Bariatric surgery, Gastrectomy, Ileal resection, N2o anesthesia , Postgastrectomy syndrome
Infectious Disease	Bothriocephalosis, Diphyllobothrium latum
Musculoskeletal/Orthopedic	No underlying causes
Neurologic	No underlying causes
Nutritional/Metabolic	Cobalamin malabsorption, Excessive alcohol consumption, Insufficient diet, Veganism, Vegetarianism
Obstetric/Gynecologic	No underlying causes
Oncologic	No underlying causes
Ophthalmologic	No underlying causes
Overdose/Toxicity	Excessive alcohol consumption, Nitroux oxide abuse
Psychiatric	No underlying causes
Pulmonary	No underlying causes
Renal/Electrolyte	No underlying causes
Rheumatology/Immunology/Allergy	Crohn's disease, Systemic lupus erythematosus
Sexual	No underlying causes
Trauma	No underlying causes
Urologic	No underlying causes
Miscellaneous	Idiopathic

Cause in Alphabetical Order

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