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The 21 pages that link to Vitamin B12 deficiency, each with the reason it gives.

• AnemiaRelated: It can cause macrocytic anemia and guides targeted testing.

• DementiaCompared with: Testing can reveal a treatable contributor to cognitive decline rather than an irreversible dementia process.

• Vitamin B12Broader topic: It is the main clinical condition detected and treated through B12 testing and replacement.

• Proton pump inhibitorRelated: Long-term acid suppression may reduce absorption of food-bound vitamin B12 in some people.

• Iron deficiencyCompared with: It is another nutritional cause of anemia, typically producing larger rather than smaller red cells.

• Diabetic neuropathyCompared with: It can cause sensory symptoms resembling diabetic neuropathy and may coexist with diabetes.

• NeutropeniaRelated: It is a nutritional cause that may contribute to low neutrophil counts.

• ReticulocyteRelated: Treatment can trigger a marked reticulocyte rise as effective red-cell production resumes.

• MalabsorptionRelated: It can result when disease disrupts B12 absorption in the terminal ileum.

• Megaloblastic anemiaRelated: It impairs DNA synthesis and is a major cause of megaloblastic anemia.

• Intrinsic factorNarrower topic: Loss of intrinsic-factor-mediated uptake is a major cause of this deficiency.

• One-carbon metabolismCompared with: It disrupts methionine synthase and creates a functional block in folate cycling.

• Wernicke encephalopathyCompared with: It can impair gait and cognition, but usually develops through different mechanisms and patterns than acute Wernicke encephalopathy.

• CyanocobalaminNarrower topic: Preventing and correcting this deficiency is cyanocobalamin’s primary clinical purpose.

• OmeprazoleRelated: Prolonged acid suppression may reduce absorption of food-bound vitamin B12 in some people.

• Methylmalonic acidRelated: Deficiency can reduce adenosylcobalamin-dependent breakdown and elevate methylmalonic acid.

• Thiamine deficiencyCompared with: Both deficiencies can damage nerves, but B₁₂ deficiency has distinct blood findings and mechanisms.

• B vitaminsRelated: It illustrates how a single B-vitamin deficiency can cause both anemia and neurological symptoms.

• LansoprazoleRelated: Sustained reduction in stomach acid can hinder release of food-bound vitamin B12.

• PantoprazoleRelated: Long-term acid suppression may impair release of food-bound vitamin B12.

• EsomeprazoleRelated: Sustained acid suppression may reduce absorption of food-bound vitamin B12 in some people.