Many diverse theories and accounts, scattered across different disciplines, have already been proposed about self and its nature, but the self has still remained ambiguous without a clear definition universally accepted by the majority of social scientists or philosophers and it is worth understanding why. In this regard, there are some problems that need to be addressed, including the multidisciplinarity, polysemy, diversity, similarity, multi-referentiality, linguistic and semantic issues, and so forth. Also, at issue is the improper use of the term ʹselfʹ, that is a serious oversight putting the concept into a state of increasing confusion. The primary aim of the present study is to clarify some of the confusion surrounding the self and to identify its various meanings already used in psychology, philosophy, sociology, and neuroscience. Another is to provide some plausible explanations for why the self has become so problematic, and also to shed light on the obstacles to achieve a general consensus on its definition. In the end, possible solutions for dealing with the problem are suggested.