Vertical lines on fingernails are furrows that run from the tip of the fingernail down to the cuticle, also known as longitudinal striations or bands. They are usually harmless and are often an indication of aging. However, vertical ridges can also be caused by decreased circulation to fingertips, stripping nails with solvents during manicures, tumors, and certain dermatological conditions. Some types of anemia may also influence vertical ridges in the nails, often accompanied by color changes in the nails or changes in texture.

It is important to note that vertical ridges in fingernails are usually not a cause for concern. However, if the cause of the ridges is unclear, or if they are accompanied by other symptoms like texture changes in the nails, it may be caused by a medical condition. In such cases, a trip to a dermatologist may help in diagnosing the underlying cause of the ridges.

In summary, vertical lines on fingernails are usually harmless and are often an indication of aging. However, they can also be caused by other factors such as decreased circulation, tumors, and certain dermatological conditions. If the cause of the ridges is unclear or if they are accompanied by other symptoms, it is important to seek medical attention.