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.
Conversely hypervitaminosis is the syndrome of symptoms caused by over-retention of fat-soluble vitamins in the body.
Types
Avitaminoses include
vitamin A deficiency causes xerophthalmia or night blindness
thiamine deficiency causes beriberi
niacin deficiency causes pellagra
vitamin B12 deficiency leads to megaloblastic anemia
vitamin C deficiency leads to scurvy
vitamin D deficiency causes rickets
vitamin K deficiency causes impaired coagulation.
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