In addition to dietary problems, other causes of<unk>  are known. Iron deficiency can affect vitamin A uptake; other causes include fibrosis, pancreatic insufficiency, inflammatory bowel disease, and small-bowel bypass surgery. Protein energy malnutrition is often seen in<unk> ; suppressed synthesis of retinol binding protein (RBP) due to protein deficiency leads to reduced retinol uptake. Excess alcohol consumption can deplete vitamin A, and a stressed liver may be more susceptible to vitamin A toxicity. People who consume large amounts of alcohol should seek medical advice before taking vitamin A supplements. In general, people should also seek medical advice before taking vitamin A supplements if they have any condition associated with fat malabsorption such as pancreatitis, cystic fibrosis, tropical sprue, and biliary obstruction. Other causes of<unk>  are inadequate intake, fat malabsorption, or liver disorders. Deficiency impairs immunity and hematopoiesis and causes rashes and typical ocular effects (e.g., xerophthalmia, night blindness).
Vitamin A deficiency
Vitamin E deficiency
Vitamin B12 deficiency
Tetra-amelia syndrome
Biotin deficiency
Chromium deficiency
Iodine deficiency
Child abuse