This study investigated how emotion changes within persons across different episodes of romantic relationship conflict. Presumably, changes in different types of emotion are linked to changes in the types of underlying adaptive concerns people have during conflict, which in turn are linked to changes in the types of emotion that one's partner is perceived to express. Over the span of 8 weeks, 105 college students in romantic relationships completed between 2 and 5 online assessments of a recent relationship conflict. Hierarchical linear modeling was used to distinguish within-person effects from between-person effects. Results confirmed expected differences between types of emotion and types of underlying concern, indicated that most effects occur at the within-person level, and identified mediating pathways.