The new Chilean regulation about patients’ rights and duties is generating a significant change in the information that health care professionals must provide to their patients. This issue will gravitate on medical liability. If this duty is accomplished incorrectly, professionals would fall into an illicit act and become liable to lawsuits and compensations to patients. This article provides a panoramic view about the grounds and content of the duty to inform and how judges are regulating the issue.The new Chilean regulation about patients’ rights and duties is generating a significant change in the information that health care professionals must provide to their patients. This issue will gravitate on medical liability. If this duty is accomplished incorrectly, professionals would fall into an illicit act and become liable to lawsuits and compensations to patients. This article provides a panoramic view about the grounds and content of the duty to inform and how judges are regulating the issue.