"The exact clinical relevance of the study findings is not known. Future studies are warranted to address the clinical relevance of median nerve enlargement in high smartphone users," lead author Esra Erkol Inal from Suleyman Demirel University, Turkey was quoted as saying.

"Still, youngsters should be aware of the dangers of these pocket devices," she added.

A hand-held smartphone compels the user to engage in repetitive flexion/extension of the wrist and to use their thumb to text, movements that are involved in the etio-pathophysiology of CTS, the researchers said.

Research suggests that students now typically spend more than three hours a day texting, emailing, scheduling, and browsing the internet on their mobile phone. The current study included 102 university students, 66 of whom used a single-hand-held smartphone and 36 of whom didn't use a smartphone.