Nails
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TEXTURE: Split, cracked, brittle nails Brittle, cracked nails can ruin a good manicure, but there are bigger issues at stake here — namely, your thyroid gland. Your thyroid gland produces hormones and plays a major role in regulating your metabolism and energy. If it's underactive and hormone levels are low, it usually manifests as dry skin, hair that falls out, and very brittle nails that struggle to grow. If this is the case, ask your doctor for a quick blood test to find out if your hormone levels and thyroid are normal. On a less scary but still depressing note, brittle nails are also a classic sign of getting old, says Steele. "This is especially true of ridging and brittleness. The intrinsic moisture in the nail tends to decline with age, as it does the moisture in our skin."
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