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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.