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Stripes or ridges on the thumbnail can be caused by various factors, including aging, nutritional deficiencies, and medical conditions. Vertical ridges are common and often harmless, while horizontal ridges, known as Beau's lines, can indicate past trauma or health issues. In some cases, they may reflect changes in nail growth due to stress or systemic illnesses. If you're concerned about the appearance of your nails, it's best to consult a healthcare professional.

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5d ago

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