There's an old saying that the eyes are the window to the soul, and it's one I love to think about. But your eyes are more than a window to the soul, they can also be a window into the state of your health.

Your eyes are tough, and yet one of the most sensitive parts of your body. Because of this, they can often serve as the canary in the coal mine for your health. They warn you often before you experience any other symptoms.

Here are 14 signs of health problems to keep an eye on. (Pun intended)

Thinning eyebrows.

One of the things your eyes warn you of is a disorder of the thyroid. If you experience sudden thinning of the eyebrows, that's one sign you have an issue with your thyroid.

Other symptoms you might experience include depressed mood, muscle and joint pains, headaches, dry skin, brittle hair, irregular periods, and severe fatigue.

If you suspect you have an issue with your thyroid, see a doctor right away.