Nail Fungus 101 – Types, Causes, & Treatment Fungal nail infections, also known as onychomycosis are common. These nail infections affect up to 14% of the general population, with fungal toenail infections being more common than fungal fingernail infections. These infections can cause nails to become thick, fragile, cracked, discolored, and painful. People that suffer from fungal toenail infections often have some type of fungal infection on the foot, such as athletes foot, ringworm, or









