Anxiety and depression are common among patients with chronic physical illnesses
and have a significant impact on morbidity, quality of life, and health service
utilisation. Psychological treatment of anxiety and depression has small to
moderate efficacy in this group and is not commonly based on a model of causal
mechanisms. A novel approach to understanding and improving mental health
outcomes in physical illnesses is needed. One approach may be to explore the
role of metacognitive beliefs which are reliably associated with anxiety and
depression in individuals with mental health difficulties. The current
systematic review aimed to evaluate the contribution of metacognitive beliefs to
anxiety and depression across physical illnesses. Systematic searches were
conducted on Web of Science, PsychINFO, MEDLINE, Embase, and CINAHL of studies
published between 1997 and January 2019. 13 eligible studies were identified
that in sum comprised 2851 participants. Metacognitive beliefs were found to
have reliable, moderate, positive and significant associations with anxiety and
depression symptoms across a range of physical illnesses. There appeared to be
commonality and some specificity in the relationships. Negative metacognitive
beliefs concerned with uncontrollability and danger of worry were associated
with both anxiety and depression across all physical illnesses assessed, whilst
more specific associations emerged for individual medical conditions where
positive beliefs about worry, cognitive confidence and cognitive
self-consciousness were unique correlates. Negative metacognitive beliefs of
uncontrollability and danger significantly and positively predicted symptoms of
anxiety and depression after controlling for factors including age, gender,
disease factors and cognition (illness perceptions and intolerance of
uncertainty). The results suggest that the metacognitive model of psychological
disorder is applicable to psychological symptoms of anxiety and depression
across a range of chronic medical conditions, implying that metacognitive
therapy might be helpful in improving outcomes in multiple morbidities that
involve poor mental and medical health.