[Health inequality among vulnerable groups in Mexico: older adults, indigenous people, and migrants].

Health vulnerability refers to a lack of protection for specific population groups with specific health problems, as well as the disadvantages they face in solving them in comparison with other population groups. This major public health problem has multiple and diverse causes, including a shortage of trained health care personnel and the lack of family, social, economic, and institutional support in obtaining care and minimizing health risks. Health vulnerability is a dynamic condition arising from the confluence of multiple social determinants. This article attempts to describe the health situation of three vulnerable groups in Mexico-older adults, indigenous people, and migrants-and, after defining the needs of each, explore measures that could contribute to the design and implementation of public health policies better tailored to their respective needs.