Health care for trans people has not been among the priorities of Bioethics, so that in most of the manuals of this discipline there is no reference to this issue, or it is covered in a rather simple or measured way. However, it is necessary to note that in the last decade the bioethical debate, on gender issues in general and on transsexualism in particular, has increased significantly. This work seeks to offer the transsexual person, the health professional or the student on the trans topic tools to articulate their particular bioethical reflection. It has two clearly differentiated parts. In the first, the aspects that are considered necessary to consider when assessing the ethics of a gender change intervention are presented. In the second part, a reflection is offered on the lines of argument that support the different bioethical currents..