Any disease caused by insufficient presence in the body of a specific factor necessary for the conduct of a fair and optimal organ function. Such an event may be insufficient for introduction into the body of the substance or essential elements of it (for example iron for hemoglobin formation), and an inability to produce organic substances, and finally to excessive removal of them can not be compensated by increases in their production.
The vitamin deficiency and pernicious anemia are typical deficiency diseases.
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