<P> Examples are vitamin A deficiency, folate deficiency, scurvy, vitamin D deficiency, vitamin E deficiency, and vitamin K deficiency . In the medical literature, any of these may also be called by names on the pattern of hypovitaminosis or avitaminosis + (letter of vitamin), for example, hypovitaminosis A, hypovitaminosis C, hypovitaminosis D . </P> <P> Conversely hypervitaminosis is the syndrome of symptoms caused by over-retention of fat - soluble vitamins in the body . </P> <Ul> <Li> Vitamin A deficiency can cause keratomalacia . </Li> <Li> Thiamine (vitamin B1) deficiency causes beriberi and Wernicke--Korsakoff syndrome . </Li> <Li> Riboflavin (vitamin B2) deficiency causes ariboflavinosis . </Li> <Li> Niacin (vitamin B3) deficiency causes pellagra . </Li> <Li> Pantothenic acid (vitamin B5) deficiency causes chronic paresthesia . </Li> <Li> Vitamin B6 </Li> <Li> Biotin (vitamin B7) deficiency negatively affects fertility and hair / skin growth . Deficiency can be caused by poor diet or genetic factors (such as mutations in the BTD gene, see multiple carboxylase deficiency). </Li> <Li> Folate (vitamin B9) deficiency is associated with numerous health problems . Fortification of certain foods with folate has drastically reduced the incidence of neural tube defects in countries where such fortification takes place . Deficiency can result from poor diet or genetic factors (such as mutations in the MTHFR gene that lead to compromised folate metabolism). </Li> <Li> Vitamin B12 (cobalamin) deficiency can lead to pernicious anemia, megaloblastic anemia, subacute combined degeneration of spinal cord, and methylmalonic acidemia among other conditions . </Li> <Li> Vitamin C (ascorbic acid) short - term deficiency can lead to weakness, weight loss and general aches and pains . Longer - term depletion may affect the connective tissue . Persistent vitamin C deficiency leads to scurvy . </Li> <Li> Vitamin D (cholecalciferol) deficiency is a known cause of rickets, and has been linked to numerous health problems . </Li> <Li> Vitamin E deficiency causes nerve problems due to poor conduction of electrical impulses along nerves due to changes in nerve membrane structure and function . </Li> <Li> Vitamin K (phylloquinone or menaquinone) deficiency causes impaired coagulation and has also been implicated in osteoporosis </Li> </Ul> <Li> Vitamin A deficiency can cause keratomalacia . </Li>

Symptoms of vitamin a d e and k deficiency
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