Avitaminosis

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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