This thesis examines two aspects of social inequalities in health with three empirical studies that are based on the Swedish Level of Living survey (LNU): The relationship between accumulated occupational class positions during adulthood and health and the class-specific nature of gender differences in health. Previous research continuously finds that there are health differences by class and gender, but less is known about the extent to which accumulated class experiences in adulthood are related to health or how gender differences vary by class. The overall conclusion in this thesis is that occupational class experiences matters for health, both as historical and current experiences. Furthermore, the results highlight the importance of taking class into consideration when examining health differences between men and women, as the mechanisms that underlie the gender gaps in health are not necessarily the same for all classes. The studies can be outlined as: Study I: Class differences in working conditions is a mechanism that underlies class inequalities in health. The working class is generally more exposed to adverse working environments than non-manual employees, and when the wear and tear of these conditions accumulate over time, the length of this exposure may contribute to class inequalities in health. Thereby, accumulated time in the working class is studied as a partial explanation for class differences in health. The results suggest that the duration of time in the working class is related to a higher probability of less than good self-rated general health (SRH), given current class position. This association was also found among individuals who were no longer in working class positions and thus show that duration of experience matters, both as current and past experience. Study II: The study addresses the research gap of class-specificity in gender health inequality and seeks to further disentangle class and gender by studying gender gaps separately by class. The results show that there are class-specific gender gaps for both SRH and musculoskeletal pain, while the gender gap in psychiatric distress appears to be more general across class. Working conditions do not explain the between-class differences in gender gaps but contribute to specific gender differences in health within classes. Study III: The labour market has changed over time and has “upgraded” the class structure while at the same time the share of women in paid employment has increased. Therefore, female health may be increasingly influenced by occupational factors, such as working conditions. This study explores the class-specific nature of gender differences and investigates musculoskeletal pain and working conditions among employed men and women within classes during a time-period that spanned more than 30 years. There were class-specific gender gaps in health throughout the period. The gender gap has increased more, and is wider, among non-manual employees compared to the working classes. This development could not be explained by changes in working conditions. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript.</p>