Letter to editors are one of the types of manuscript which is published in a journal. It is important to know how they help in the field of research. Therefore, the present study aims to investigate the importance and drawbacks of letters to editor. This study was conducted by searching different websites such as Medline, PubMed and Google Scholar. The literature shows that letter to editor serve as a control measure for researchers. Whereas it can also be used to damage a reputation of a researcher.