Ten or more years of mobile phone use increases the risk of developing acoustic neuroma, a benign tumor on the auditory nerve, according to a study released on Wednesday by Sweden's Karolinska Institute.

The risk was confined to the side of the head where the phone was usually held and there were no indications of increased risk for those who have used their mobile for less than 10 years, the Karolinska Institute said in a statement.

Source: Reuters.