Vitamin Deficiency Signs Table
Nutrition & Sports Nutrition Reference Tables
Vitamin Deficiency Signs Table
Deficiency signs are possible clinical findings, not a self-diagnostic checklist; overlapping causes require assessment.
| Vitamin | Possible deficiency finding | Interpretation |
|---|---|---|
| A | Night blindness | Eye disease has other causes |
| D | Rickets or osteomalacia | Consider age, bone health and laboratory context |
| C | Scurvy and impaired wound healing | Severe deficiency syndrome |
| B1 | Beriberi or Wernicke encephalopathy | Urgent clinical assessment when suspected |
| B12 | Megaloblastic anemia or neurologic problems | Neurologic disease can occur without anemia |
Vitamin Deficiency is inadequate vitamin supply or status with biological consequences that vary by nutrient, severity and duration.
True deficiency can impair function, recovery and exercise tolerance, but symptoms such as fatigue have many causes. Insufficiency often denotes less-than-desired provision or status rather than overt deficiency disease. Definitions and thresholds depend on vitamin and guidance; a single laboratory result or online label should not be converted into a diagnosis without context.
Intake, absorption and body status describe different stages. An apparently adequate recorded intake may coexist with malabsorption, illness or drug interactions. Conversely, one low-intake day does not establish clinical deficiency. Several days of intake, relevant history and an appropriate marker provide more information than one meal or nonspecific tiredness alone.
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