This study is aimed at analyzing the obesity during growth period and sleeping position as factors influencing facial asymmetry. To accomplish the objective, people in their 20 s to 50 s were surveyed. After distributing 534 copies of the questionnaire, SPSS 20.0 for Windows was used to process the results. The findings are as follows. There were more people who believe their faces are asymmetrical than the people who believe otherwise. In particular, they believed a blank look leads to an asymmetrical face more often than when talking or making a particular facial expression. In addition, all the following were longer or bigger on the right face: face length (compared to the left face); height of eye; size of the eye; degree of hollow or bulging cheek; size of cheekbone; height of cheekbone; pull in the direction. Also, the obesity before adulthood and sleeping position were influencing factors of facial asymmetry. In particular, this study explains that the obesity during growth period and sleeping position can lead to a developmental or acquired facial asymmetry.
In the future, studies need to use objectively-measured values of facial asymmetry and consider the general traits and lifestyles of individuals during analysis of the influencing factors.