Avitaminosis is any disease caused by chronic or long-term vitamin deficiency or caused by a defect in metabolic conversion, such as tryptophan to niacin.
They are designated by the same letter as the vitamin.
Avitaminoses include:
Vitamin A deficiency causes xerophthalmia or night blindness.
Thiamine deficiency causes beriberi.
Niacin deficiency causes pellagra.
Vitamin B12 deficiency leads to pernicious anemia.
Vitamin C deficiency leads to scurvy.
Vitamin D deficiency causes rickets.
Vitamin K deficiency causes bleeding.
Conversely hypervitaminosis is the syndrome of symptoms caused by over-retention of fat-soluble vitamins in the body.
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