Blood test: Although it would be uncommon, it is possible that you have an under-active thyroid condition that would explain the changes in your hair. Usually, young people are not bothered by thinning, dry hair; so there is a real possibility that you may have a metabolic problem that should be ruled out. If you have a normal thyroid, then consider changing hair-care products to see if it may simply be those.
Answered 2/20/2013
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