Your nails are more than just a place to showcase your bright-red polish. Some changes on the inside of your body can be seen through your nails. Here's what you should look for:
Horizontal lines - can be a sign of severe infection, such as a bad case of flu or extreme stress or severe trauma to the body.
Red specks- may be caused by a liver infection, such as hepatitis.
Yellow nails - could result from chronic use of nail polish, but can also indicate a breathing problem such as bronchitis.
Black nails - can occur when you bang your nails against something, but may also be the result of a vitamin B12 deficiency.
Concave nails - often referred to as "spoon nails," these may be a symptom of anemia.
White spots - may be a sign of iron deficiency.
If you notice a change in your nails, ask yourself whether the change could be the result of trauma to your nail. If not, and you're not feeling well overall, it's time to see your doc.