Have you ever noticed that when you are at your healthiest; you know, those periods of time where you are killing it physically due to going to the gym regularly or running or the line of work you are in is physical and you actually nourish yourself and rest properly your nails are beautiful and strong? Then there are the periods of time where you (I know you REALLY HATE IT ADMIT IT you were maybe even smoking cigarettes and drinking too much alcohol often with little sleep? You were eating garbage food and pushing your body to it’s limits A.k.a. ages 17-30 or so especially? Your nails did not look so good during those times. They were thin or brittle or peeling or breaking.
There are several “things” that can happen to nails that are caused by a health condition and can be a life saving signal of a need to go get looked at by a physician.