Please ACCEPT the reply (by pressing the GREEN accept button), and give a BONUS if it was useful. If you need more information, just let me know. Regards Dr. Gupta
Certain diseases can affect the color of the nails. A patient with yellow nails should be examined for a systemic disease. Since it takes weeks for a nail to grow it can manifest the health status of the person e.g. yellowing of the nails is a sign of insufficient oxygen which might be due to bronchitis or some other respiratory or possibly even a heart problem. Diabetics will sometimes have yellow nails.
I recommend that you have a complete physical exam to determine if you have a systemic cause for your yellow toenails.