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and Stanford Yee M.D

People with conditions that affect the small bowel, including Crohns disease, Celiac disease (11-41% of patients with celiac will have B12 deficiency), Small intestinal bacterial overgrowth (SIBO), parasite infections, such as giardia, tapeworm, chronic pancreatitis, and advanced liver disease

The most common vitamin B12 deficiency symptoms are: Fatigue Weakness Loss of appetite Weight loss Numbness and tingling in the hands and feet Soreness of the mouth or tongue A pale yellow tinge to your skin Difficulty maintaining balance Disturbed vision Depression Confusion Poor short-term memory A severe vitamin B12 deficiency can cause megaloblastic anemia, also known as vitamin B12 deficiency anemia, where red blood cells are not produced properly and are larger than normal

2019, pp