Deficiency (medicine)

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In medicine, a deficiency is a lack or shortage of a functional entity, by less than normal or necessary supply or function.[1]


Malnutrition can cause various effects by deficiency of one or more nutrients. For example, vitamin A deficiency causes symptoms such as xerophthalmia (dry eyes) and night blindness.

Endogenously produced proteins[edit]

Deficiencies of endogenously produced proteins such as enzymes are the underlying mechanisms of almost all genetic disorders, for example the inborn errors of metabolism.

See also[edit]


  1. ^ TheFreeDictionary > deficiency. Citing: