Marital conflicts are important issues within the family that can have various roots. One area of focus in understanding the roots of conflicts is exploring the childhood experiences of couples and the effects of these experiences on their marital life and relationships. Given the significance of the health of this type of relationship, this study aimed to identify and analyzing women's perceptions and narratives, regarding the psychological harms of their partners' and their spouses childhood experiences in marital conflicts. This research used a qualitative approach and a thematic analysis method. The study population consisted of 22 female participants, selected through a purposeful sampling logic and a convenient access method, who met the inclusion criteria for the study, including experiencing marital conflicts, until theoretical saturation was achieved. The desired data were collected and organized through semi-structured exploratory interviews conducted in stages. The findings of the study, based on the statements obtained from the interviews, included four main themes, fifteen sub-themes, and one core theme. The first main theme, "Diminished Self," included four sub-themes: passive interaction style, victimization, diminished self-esteem, and negative self-concept. The second main theme was "Weak Marital Stability," which comprised emotional immaturity, destructive behaviors, feelings of inadequacy in life, and weak marital adjustment. The third main theme was "Weak Interpersonal Trust," which had four sub-components: dysfunctional interaction patterns, feelings of insecurity, fear of intimacy, and excessive need for attention. The final main theme, "Diminished Agency," encompassed diminished agency, behavioral immaturity, and decision-making weaknesses. According to the findings of this study, the psychological harms of couples' childhood experiences play a role in marital conflicts, and these conflicts can be rooted in individuals' past experiences. This highlights the importance of therapists and counselors paying attention to these issues to enhance health and further societal objectives.