| Summary: | The last iteration of the Canadian census (2008) that included questions regarding marriage and divorce reports that approximately 40% of marriages in that year will end in divorce before the 30th wedding anniversary. While only a proxy, the high divorce rate in Canada suggests a similarly high prevalence of relationship distress, a situation where one or both partners are dissatisfied with their intimate relationship and that is characterized by conflict. Relationship distress can result in higher levels of psychological and physical health concerns in both partners, in addition to health and social role impairments among children, other family members, co-workers and friends. Recent studies have helped to identify that the association between relationship distress and negative health outcomes is cyclical. Not only does relationship distress lead to negative psychological health outcomes such as depression, anxiety and substance abuse, it can also result from situations where couples must respond to and cope with these concerns. Other contributors to relationship distress are varied and can include such experiences as the diagnosis of a terminal illness, living with chronic disease, living with mental health disorders, infidelity, unresolved childhood trauma, among others. Couples therapy is widely practiced as a means to improve relationship distress, and is often an expected course of treatment when couples are faced with conflict. The main premise of is that guiding couples through their conflict as a collaborative team is more beneficial than working with only one member alone. While couples therapy is widely practiced, the effectiveness of couples therapy as an intervention to improve relationship distress is unclear. The purpose of this review is to summarize published research and evidence-based guidelines regarding the effectiveness of couples therapy for adults experiencing relationship distress from any cause
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