<p>India ranks 3^rd in number in the smartphone use. Above 50% of worldwide population uses smartphone. The aim of the study is to find the effect of smartphone addiction on craniovertebral angle and muscle fatigue of Cervical Erector Spinae (CES) and Upper Trapezius (UT). Eighty-six healthy students took an interest in the examination. Subjects were chosen for the study with the assistance of SAS-LV form. Lateral postural assessment was done to measure CVA with the assistance of

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... graphy method. Electromyography (EMG) was utilized to compute muscle fatigue of cervical erector spinae and upper trapezius. The co-relation coefficient between addiction and CVA is r = -0.2196, that means as SAS-LV score rises, the CVA decreases. Co-relation between addiction score and mean frequencies of UT and CES by r = 0.03679 and r = -0.04472 respectively, this states that as addiction score increases UT shows fatigue however not CES. Co-relation between CVA and muscle fatigue of CES and UT by r = 0.01816 and r = -0.04472 respectively, that means as CVA increases UT shows fatigue but not CES. There is co-relation between smartphone addiction, CVA and UT and CES fatigue but it is not statistically significant (p&gt;0.05). From the statistics, it is concluded that unnecessary utilization of smartphone decreases the CVA and muscle fatigue starts to set in, in the UT however not in CES. As the CVA decreases upper trapezius shows fatigue however not cervical erector spinae.</p>