Have you noticed any marks on your nails lately? While usually not a big issue, these marks can sometimes show hidden health issues or a lack of nutrients. Here is more information about what causes ridges on nails and when it might be a good idea to see a doctor. Aging As you get older, it's normal for the vertical lines on your nails to become more visible. These lines on nails typically run from the bottom to the tip and are usually not a cause for concern. Not having enough essential nutrients. Lacking certain nutrients can also lead to changes in nail health, such as the appearance of vertical lines on the nails. Important nutrients for maintaining healthy nails include: Protein: Nails are mainly made of a protein called keratin. If you don't get enough protein, your body may struggle to make your nails strong and healthy. Lack of vitamin B12 can cause your nails to change color and texture. Not having enough iron can create vertical lines on nails and sometimes nails that appear spoon-shaped. 3. Dehydration is when your body loses too much water.