This article examines the 'boy crisis', which is now becoming a global phenomenon. Boy crisis focuses on boy's underperformance and underachievement compared to girls. The review has analyzed the present studies from the behavior of the boy crisis, the gender gap in attendance, and the gender gap in achievement where aims to determine the cause of the boy crisis and treatments can be used for boy crisis. Moreover, this paper also pointed out the potential cause of the boy crisis: the one-child policy, teacher gender gap, social environment, and education for quality. Finally, the treatments, including androgyny and single-sex school, were also reviewed to analyze the methods of reducing the cause by boy crisis in the society. However, they may need further research to confirm.