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- 1). Pay attention to any indications of weakness in the body, especially the arms and legs. This weakness may be mild or severe. It is not accompanied by sore muscles, as is common after a physical workout, but a lethargic feeling that affects coordination and strength.
- 2). Watch for a sore mouth or tongue. Look inside the mouth for signs of pale or bleeding gums. Lips may also be pale. This is a sign of anemia, one of the major symptoms of a vitamin B-12 deficiency.
- 3). Look at your skin. Is is a yellowish color? What about the whites of your eyes? This is also a symptom of hepatitis, but lack of red blood cells that induces anemia also creates this affect.
- 4). Experiencing shortness of breath or difficulty maintaining your balance is also an indication that something is not right.
- 5). Watch for episodes of decreased concentration and memory function. Vitamin B-12 deficiency may also cause depression and in some cases, dementia.
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