Objective: this research seeks to investigate, through a bibliographic analysis, an importance of the act of informing at the heart of the doctor-patient relationship, considering that this duty is directed to both parties: both health professionals and patients. Methodology: a predominantly bibliographic research was conducted, which aimed to interpret as social, normative and moral categories in order to reach a conclusion, showing a qualitative approach. Results: the duty of information is presupposed to the exercise of autonomy. Conclusion: the patient has the right to have contact with all relevant data available so that he can freely and consciously decide, as well as the doctor also has the right to be provided with all information r...