What Those Vertical Ridges on Your Fingernails Might Be Telling You — Especially After 40

known as longitudinal striations, are raised lines that run from the cuticle (the base of the nail) to the tip. Some ridges are barely noticeable, while others can be felt clearly when you run your finger across the nail.

It’s a natural part of the body’s aging process. Just as skin starts to show wrinkles and hair begins to gray, the texture and structure continue reading …