Ridges in finger nails are seen as an indicator of overall health of a person. Ridges in finger nails indicate a medical problem like respiratory disorder, anaemia, iron deficiency or thyroid disease. While the vertical ridges in the finger nails do not indicate a medical problem and these become prominent with the age.
Horizontal ridges on fingernails however can indicate a serious ailment, though it is not the case always. A special type of horizontal ridges is called Beau’s lines and often indicates an underlying illness. Ridges can also be caused by a deficiency of vitamins or malnutrition.