Fungal nail infection is a common problem affecting around three in every 100 people in the uk around half of all nail problems are due to a fungal infection fungal nail infection is about four times more common in toenails than fingernails and can involve all or part of the nail including the nail plate nail bed and root of the nail it usually affects adults especially men and becomes more common as you get older there are a number of ways of contracting fungal toenails with one of