The main aim of this paper is to analyse the singularity of the Spanish position with regard to coverage of the risk of sickness within the context of the different welfare models described in international literature. This analysis enables us to verify that in Spain, as in other countries, there were initially different forms of sickness coverage which coexisted, created by the market, by workers themselves and, gradually, by the state. Within this so-called mixed economy of welfare, the most extensive health coverage for the Spanish population was a result of the self-organization of workers, and this continued until the Civil War (1936–1939), not so much due to its efficacy and viability, as to the slow development of private insurance companies and the inability of the state to implement compulsory sickness insurance. The installation of the Franco dictatorship meant that the introduction of compulsory sickness insurance was further delayed, and when it was eventually passed, it offered only limited coverage, was enacted more for political than for social ends, and was to result in the virtual disappearance of friendly societies.