This Will Put The Cat Amongst The...
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For more on marking an answer as the "Best Answer", please visit our FAQ.It's possible it could be genetic. Did either of your parents start to lose their hair at an early age? Other reasons could be stress, strong and frequent hair colourants, too much heat from daily use of hot hairdryers and curling tongs. Also poor unbalanced diet with too few vitamins could be a cause or even long term medication.
Using a styling mousse can help your hair look as if it has more body but won't address the actual cause of thinning. If you're sure that it's not being caused by any of the above, it's probably worth consulting a doctor.