That caught me off guard

Horizontal ridges, also known as Beau’s lines, can be more concerning than vertical ridges. These ridges can indicate a temporary interruption in nail growth due to illness, injury, or stress. Conditions such as severe infections, high fever, or even surgery can cause Beau’s lines.

In some cases, horizontal ridges may be a sign of more serious health issues, such as uncontrolled diabetes or vascular disease. If you notice horizontal ridges on your nails, especially if they are deep or accompanied by other symptoms, it is advisable to seek medical evaluation.