Conversely, some studies show that a deficiency in vitamin B12 may cause appetite loss, potentially leading to weight loss if left untreated ( If youre low or deficient in B12, your healthcare provider will likely recommend oral vitamin B12 supplements or injections to increase your blood levels ( summary Low levels of vitamin B12 can cause megaloblastic anemia, which is characterized by shortness of breath, headaches, and fatigue
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Thus, dietary supplement B 12 supplementation at 500 to 1000 g per day allows pernicious anemia and certain other defects in B 12 absorption to be treated with daily oral megadoses of B 12 without any correction of the underlying absorption defects
Differentiating from Other Conditions Neurological signs and symptoms can be vitamin B12 deficiency associated or due to other causes such as: Pernicious anemia Syphilis Neurosyphilis Human immunodeficiency virus (HIV)-associated vacuolar myelopathy Toxic neuropathies Tropical myeloneuropathy Your healthcare provider can make a proper diagnosis based on your symptoms, medical history, physical exam, and laboratory test findings