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Causes of Greying of hair

Graying of hair can be seen as part of  Aging process
Starts at an age >20 in whites and at an age > 30 in black
Poliosis is the presence of grey hair in circumscribed pattern
What are the causes of premature graying of hair?
  • Megalobastic anemia
  • Diabetes mellitus
  • Hyperthyroidism
  • Dystrophia myotonica
  • Rare syndromes like Werners syndrome ,Vogt Koyanagi syndrome, Waardenbure syndrome, Chediak-Higashi syndrome.
Flag sign is the brownish discolouration of hair, with interspersed normal colour of hair, is seen
in protein energy malnutrition