Background Teenagers widely use digital devices for information sharing and other daily activities. Their heavy reliance on smartphones and tablets may contribute to repetitive-use injuries of the thumb. Objectives This study aimed to investigate the prevalence of texting thumb (TT) among medical students and to identify the potential associations between TT and behavioural patterns during digital device use. Design, setting and participants This cross-sectional study employed an online, self-developed questionnaire to assess demographic and behavioural patterns associated with smartphone use. Data on thumb pain and its features were evaluated for diagnostic purposes. This study comprised medical students from six medical schools in Jordan. Data were collected from 482 medical students, excluding those who did not meet the inclusion criteria. Results The prevalence of TT was 34%, predominantly on the right side (53%) and at the thumb base (69%). The findings suggest that TT was significantly associated with specific behavioural patterns, including supporting the forearm (p=0.026, adjusted OR: 1.611; 95% CI 1.059 to 2.449), number of texting per day (p=0.005, adjusted OR: 1.319; 95% CI 1.086 to 1.603) and studying hours per day using a digital device (p=0.002, adjusted OR: 1.586; 95% CI 1.193 to 2.109). Also, students’ attitudes toward thumb pain were significantly associated with the TT (p=0.005, adjusted OR: 1.351; 95% CI 1.094 to 1.668). Conclusion Students’ attention to behavioural patterns is crucial when using digital devices. Supporting the forearm, limiting text message use, avoiding prolonged use of digital devices, never ignoring hand pain and resting the hand significantly reduce the risk of thumb overuse injury.
Salameh et al. (2026) studied this question.