You’ve probably heard the ever-so-common phrase, “listen to your body,” and while this is without a doubt true, you should also be observing your body constantly, especially your nails. And not only to see if they need a cut or if the regular polish you used three days ago is peeling, but also for any unfamiliar signs.

“The nail is an area that gets compromised when our body needs to preserve metabolic function for other things,” explains Michelle Henry, a board-certified dermatologist and the founder and CEO of Skin & Aesthetic Surgery of Manhattan.

Nails may seem like a simple, straightforward body part, but there’s more to them than meets the eye. Your nails have three key parts:

The nail bed and the nail matrix are “very sensitive to any changes in your overall health,” Dr. Henry t

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