 child marriage before the age of 18 affects over 12 million girls globally every year, leading to serious physical and mental health consequences. Despite acknowledging the negative impacts of this practice on reproductive health, mental health has been largely ignored. This can lead to increased risk of depression, anxiety, substance abuse, and other mental health problems. To address this gap in knowledge, our study is the first to examine how mental health is addressed in current literature on child marriage. We conducted systematic reviews of existing research, including both qualitative and quantitative studies, to identify the social factors associated with mental health outcomes among those who have experienced child marriage. Our findings suggest that intimate partner violence, poverty, challenges during childbirth, and isolation are all linked to emotional distress. Additionally, depression was the most commonly reported mental health condition. Other mental health conditions such as anxiety, phobias, psychological distress, substance misuse, negative well-being, and antisocial personality disorder were also reported less frequently. These findings highlight the need for further research into the causal links between child marriage and mental health, as well as the development of. This article was authored by Rachelle A. Burgess, Mary Jeffrey, Sabina, Adhiyambo Ottero, and others.