LOS ANGELES- Cases of toenail fungus have been common this year. Experts suggest that if you are suffering from Toenail Fungus or any other foot related diseases, you can simply look for on the net. Toenail Fungus is a very common infection in the nails which causes your toenails to thicken. Toenails affected with this condition are usually yellowish or very cloudy in appearance. The nails will usually be rougher and quite crumbly, which makes it easy to separate from your nail bed.