“If you are looking at your thumb, the area between the bottom end of the nail where the cuticles are and the thumb joint is where the nail matrix is under the skin,” explains Dr. Horizontal riding (also called Beau's lines) is usually caused by things other than aging, most commonly damage to the nail matrix. “Longitudinal ridging of nails is usually age-related and usually nothing to worry about.” However, decreased circulation to fingertips, stripping nails with solvents during manicures, tumors and certain dermatological conditions can also cause vertical ridges in nails, she says. “Just as your skin starts to show age-related changes such as thinning and sagging, nails also show signs of aging,” says Dr. Whether the ridges in your nails are vertical or horizontal can be a clue to what’s causing the ridging.
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