Keeps life from getting dull, doesn't it laugh

Recently my nails showed more white irregularly at the tips. In addition, I seem to have developed these horizontal white lines under my nails, which I'm sure weren't there a year ago. I polish my nails regularly so I would know. No pitting though, and thicker nails only on the outer toes (pinkie toes? What do you call them?), which is of no diagnostical value since they take regular hits from shoes, apparently.

Not that bothered about the name of the diagnose, though. The treatment's the same.