Patient self-disclosure is essential to the work of health professionals, and this is even more critical in mental health where speech is a reflection of the content of thought. Self-disclosure is then about invisible symptoms that are associated with health problems where discrimination and stigmatization are still very prevalent. This article explores the ethical issues of this phenomenon which has received very little study. Disclosure as a decision-making, interpersonal, dynamic and complex process will be defined and deepened with the help of examples from research. Subsequently, the vulnerability of the person who discloses will be addressed, followed by issues of quality of care and related to the standards of professional practice associated with patient disclosure and their associated responsibility. These elements highlight many ethical issues and ultimately lead us to a proposal to situate the professionals involved.