Nail fungus infections are the most common conditions that affect the nails. About 50 percent of nail abnormalities are caused by such infections. Fungus is naturally found in the body, but it may wreak havoc when it grows and spreads. This nail infection is also known as onychomycosis or tinea unguium.
Nail fungal infections can affect both fingernails and toenails, although they affect toenails more. This condition is often manifested by symptoms such as discoloration of the nails, thickening, and crumbling of the edges.