Vitamin B12.
Sources of vitamin B12 include eggs and meat and dairy products. The vitamin is necessary for the function of the nervous system and the production of blood cells. Vitamin B12 is absorbed in the small intestine after binding to a protein released by the stomach. A deficiency of vitamin B12 can be caused by poor diet, alcoholism, Crohn's disease, certain parasites and pernicious anemia. If you have a risk factor for a vitamin B12 deficiency, consult a doctor to discuss preventative action and be aware of the symptoms of a deficiency.
Mild Symptoms
Fatigue, weakness and pale skin may be the first signs of a vitamin B12 deficiency. You may notice cracked lips or a ringing in the ears, and you might experience a loss of appetite or an altered sense of taste that causes food to taste funny or odd. Alternating bouts of diarrhea and constipation are common, and some people may become dizzy when standing up. Fever or abdominal pain may also be present.
Mental Effects
A vitamin B12 deficiency can cause an altered mental state in severe cases. Advanced stages of a severe vitamin B12 deficiency can cause a state of confusion. Mild to moderate depression is a common symptom, but severe depression can also be the result of a deficiency.
Other Symptoms
According to Harvard Medical Publications, other symptoms may include a tingling sensation in the hands or feet, a stinging or burning sensation on the tongue, a bright red tongue, significant weight loss, yellowing of the skin and a rapid heart rate. It can also cause you to feel off balance or disoriented, which may worsen in darkness. Some people may lose the ability to tell the colors yellow and blue apart. You may be unable to feel vibrations in your feet or legs. Anemia may develop.
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