Eastside Office

1500 N Wilmot Rd

Suite A230

Tucson, AZ 85712-4416

Northwest Office

7520 N. La Cholla Blvd.

Tucson, AZ 85741

The most common cause of yellow discoloration in the toenails is a fungal infection. The fungus often develops underneath the nail, resulting in it becoming thick, raised, and yellow in color. Other potential causes for yellow discoloration of the nail include diabetes mellitus and lymphedema (chronic leg swelling). Yellow staining of the nails can also occur in individuals who use nail polish. A stained nail may take several months to grow out.