Dry Hair It's usually hair care practices (skimping on conditioner, ODing on hot tools) or environmental factors (hello, winter weather) that are to blame for dry strands. But if you've ruled out both of those and your locks are still lacking in moisture, it may be something deeper. Dry hair can also be a sign of hypothyroidism, says Shah, a condition in which your thyroid doesn't produce enough hormones. It's easily tested for and treated, so this is a symptom worth bringing up to your doctor.
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