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The lack of information is because of insufficient human clinical trials

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Common reasons include: Pernicious anemia , an autoimmune condition affecting intrinsic factor production Gastrointestinal disorders, such as Crohns disease or celiac disease Prolonged use of certain medications, like proton pump inhibitors Knowing these causes helps spot at-risk people

The American Academy of Family Physicians and NIH identify the following clinical manifestations: Fatigue and generalized weakness Megaloblastic anemia (abnormally large, immature red blood cells) Tingling or numbness in the hands and feet (peripheral neuropathy) Difficulty walking and balance problems Cognitive disturbances including memory difficulty and confusion Mood changes, including depression and irritability Glossitis (swollen, inflamed tongue) Early symptoms such as fatigue and mild tingling are often attributed to stress, aging, or other conditions