What does it mean when you get ridges on the surface your fingernails?

Vertical fingernail ridges are ones that start under the cuticle and extend to the end of the nail. These are not to be confused with horizontal nail ridges (running across the nail). The actual source or cause of these vertical ridges is unknown, but heredity is thought to play a role. These ridges tend to become more prominent as we age. Vertical ridges do not pose a health problem - although sometimes the nail becomes weaker at these ridges and will split. There is NO product on the market that can make these ridges go away. If you are getting splitting at these ridges then gently file the ends of your nails to help stop snagging. Also a penetrating nail conditioner not only helps maintain your nails, but it is an excellent way to lessen the chances of your nail cracking or breaking at these ridges. Again, don't confuse vertical ridges with horizontal ridges. If your nails change color or have HORIZONTAL ridges you should see your doctor as this could indicate a health problem. source: http://www.flexinail.blogspot.com/search/label/nail%20ridges