Recent research has revealed that the diagnosis rate of bipolar disorder is increasing rapidly, especially among adolescents. Although some attempts have been made to address this issue, it is still worth further research. This paper provides new insights into the phenomenon that bipolar disorder has been overdiagnosed among teenagers in China. Basically, the purpose of this paper is to make a more comprehensive and in-depth analysis of the background, current situation, controversy, factors, and possible consequences of the overdiagnosis of bipolar disorder. In the following, this paper introduces some domestic and foreign research results, and shares authoritative opinions and reflections about the overdiagnosis of bipolar disorder. To conclude, this paper provides detailed information about the overdiagnosis of bipolar disorder, analyzes the status quo of psychiatric diagnosis and summarizes related literature, suggesting that the process of diagnosing bipolar disorder is problematic. Therefore, its essential for us to revisit our diagnostic criteria as well as proper treatment.