Have you ever noticed that people’s toenails thicken with age, even though fingernails don’t? Why is that?  If you thought it was all caused by toe fungus, you’d be wrong! Read what Dr. Richard K. Scher, head of the nail section at Weill Cornell Medical College, has to say about the changes that happen to toenails over time in this interesting NY Times article, Toenails and Time, long-term trauma, impaired circulation, stress are the culprits!