Even though toenail fungus conjures all kinds of unpleasant images, it is a serious infection that needs to be treated right away. What may be surprising is there are many millions who contract this unsightly fungal infection. Any type of fungus that grows enough to become an infection needs to be taken care of quickly. If you want to keep your toenails, or fingernails, then you must begin treatment for this type of infection immediately. This variety of fungus is more common in toenails, but you can certainly get it under your fingernails, too. However it is more common in toenails simply because the fungus prefers dark and relatively damp environments. Also bear in mind that this spreads very easily from one person to the next, or in community conditions.