Background: Nomophobia (No MObile PHone PhoBIA) refers to the worry or fear that individuals experience when they are without their mobile phone or they are unable to use it. The term was first coined in 2008 and it is considered a modern type of phobia. The aim of the present study was to retrieve and review the most relevant literature on the prevalence of nomophobia and its relationship with psychosocial and physical health among young adults.

Methods: A systematic literature review was conducted according the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) for original papers on the phenomenon of nomophobia in young adults using the Nomophobia Questionnaire (NMP-Q) as the main measuring instrument. The literature was focused on the 3 main topics of prevalence and level of nomophobia, nomophobia and psychosocial effects, and nomophobia and physical health in young adults.

Findings: The initial literature corpus consisted of 370 articles of which 40 met the inclusion criteria and were analyzed in detail. Nomophobia was observed among 15.2%-99.7% of the participants. Research findings indicated increased psychological, emotional, social, and physical side effects due to excessive smartphone use.

Conclusion: The excessive use of the smartphone is an emerging threat for social, mental, and physical health. There is an increased need for further research in this regard as it is evolving into an epidemic outbreak and concerns directly the field of public health.