Would you believe that just looking in the mirror might help you get valuable information about the state of your health? It's true -- in some cases, health problems are written all over your face (or skin, hair, nails, and belly). Here are some of the visible outside signs that you might need to schedule a checkup to find out what's happening on the inside.
Dry, dull hair -- you know the kind; it almost makes a crackling sound when you scrunch it -- may be a sign that you're not getting enough important vitamins (such as B12, E, C, and biotin).
