RESUMO
Balneotherapy comprises the use of natural mineral waters for health and/or well-being purposes. When balneotherapy is offered by the public health system, some countries with Latin-based languages call it social thermalism. The aim of this study is to compare balneotherapy in health systems of Spain, France, Italy, and Portugal. The study involves a qualitative systematic review of the literature using the systematic search flow method. Twenty-two documents, from 2000 to 2022, were included and its findings were described in seven categories: the first outlines the historical characterization of social thermalism in the systems analyzed and the others outline the components of the health systems: coverage/access, health financing, workforce, inputs and techniques, organization and regulation, and network provision of services. The models of insurance and social security that cover part of the thermal treatment are highlighted. Doctors with competence in medical hydrology constitute the majority of the workforce. Similarities regarding inputs and techniques are observed, with variation in the number of days of the balneotherapy treatment cycle. In the regulation of services, the Ministry of Health of each country is prominent. The provision of services is mainly performed in specialized care in accredited balneotherapy establishments. Despite the limitations of the method, the comparisons made may serve to support public policies for balneotherapy.