Your fingernails can reveal more than you might expect. Because nails grow slowly from the matrix beneath the cuticle, they often reflect changes happening inside the body over time. It’s common to notice lines or ridges on your nails, and in many cases, these changes are completely harmless. As people age, the nail-growing process naturally becomes less uniform, making certain patterns more noticeable.

The most common type of nail line is the vertical ridge, which runs from the base of the nail to the tip. These ridges usually develop gradually and are considered a normal part of aging. However, not every change in nail appearance has the same cause. Some patterns can signal that the body has experienced something more significant…