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Nutritional deficiencies (especially iron, zinc, or vitamin B12)
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Autoimmune disorders (e.g., psoriasis, alopecia areata, lupus)
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Thyroid imbalances (hypothyroidism or hyperthyroidism)
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Inflammatory conditions (like eczema or arthritis)
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Stress or trauma to the nail matrix
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Aging (natural vertical ridges may increase over time)
Preparation (What to Observe and How to Respond):
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