There are a handful of surface signs that something is going wrong with your body; if your hair starts falling out, your skin gets red and flaky, or your eyes become discolored, you know you should see your doctor right away. Yet, there is one other home-grown tool to help you determine whether your health is out of whack: your nails. In many ways, your fingernails are excellent diagnostic instruments. Because they grow so quickly, they can tell you (and your doctor) almost exactly what is going on inside you, and you can receive the treatment you need to feel better faster. Here are a handful of nail-related signs and…