In the professional practice of Social Psychology, the field of Public Health takes on special relevance because it is the social workers, through the social services of Public Health, who will determine the prevention of diseases, the promotion of Public Health, adherence to treatment, follow-up and channelling of the vulnerable, excluded or marginalised population that leads the number of deaths due to diseases related to poverty and unemployment. In our experience, social diagnosis and socio-economic studies are tools par excellence for the establishment of preventive and public health promotion networks.