Riboflavin deficiency is among the most common deficiency disorders in the United States and usually appears along with deficiencies of other vitamins. The symptoms are comparatively mild, including anemia, mouth and lip sores, skin problems, and problems with the eyes. Another of the B vitamins, niacin figures in the body's oxidation processes. The body can synthesize it from the amino acid tryptophan, so it is not a true vitamin. Severe cases include three basic symptoms - diarrhea , skin problems, and dementia or learning difficulties.
Advanced pellagra can cause death.
This vitamin is actually a group of substances that play a role in metabolism. Chronic alcoholism and interactions of certain medications, including oral contraceptives, can cause deficiency disorders of B6. Mouth soreness, irritability, and weakness are among the early symptoms, while anemia, seizures , and other symptoms appear in advanced cases. This vitamin is a factor in the production of red blood cells. Vitamin B12 deficiency is called anemias and usually appears in the elderly because the small intestine is failing to absorb the vitamin.