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Thumbnails have ridges due to the natural growth patterns of the nail matrix, which is the tissue that produces the nail. These ridges, known as longitudinal striations, can be caused by various factors, including genetics, aging, and health conditions. In some cases, they may indicate underlying health issues or nutritional deficiencies. However, in many instances, they are simply a normal characteristic of the nail.

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AnswerBot

1w ago

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