A recent collaborative study has suggested that loneliness can have a strong influence on health generally, with people who are socially isolated being far more likely to experience poorer mental health and lower well-being, reports MedicalXpress.
The study team, led by the University of Bristol, British research and innovation centre Nesta, and Amsterdam University Medical Centre, said lonely people had worse general health, and tended to experience multiple health conditions.
Loneliness is increasingly recognised as a major public health issue, with growing evidence connecting it to poorer health. However, it is unclear whether loneliness itself contributes to poor health or whether these links are driven by other factors.
The study, in association with the Universities of Oxford and Manchester, combined evidence from three different research methods, including observational analysis, sibling comparisons and Mendelian randomisation, a genetics-based approach, to build a clearer understanding of these relationships.
Using data from the UK Biobank and large-scale genome-wide association studies, the researchers investigated how both loneliness – the quality of a person’s social relationships – and social isolation, the number of social connections, relate to health and well-being.
The study was published in Nature Communications.
Different risks, different measures
The findings suggest that loneliness, and potentially social isolation, remain important public health issues, particularly because of their links with mental health, well-being and overall health.
As loneliness becomes an increasingly important public health challenge, tackling it could bring benefits for both individuals and society, experts believe.
Dr Zoe Reed, research fellow in the School of Psychology and Neuroscience at the University of Bristol, and corresponding author, said: “Our findings suggest that loneliness, and possibly social isolation, are still important public health concerns, especially for mental health and general health. Supporting people who feel lonely or socially isolated could help improve mental health, well-being and overall health.”
Lauren Bowes Byatt, director of Nesta’s healthy life mission, added: “This research underlines that loneliness is likely to have a detrimental impact on our mental health and well-being. While this link may seem obvious, the topic has long been understudied.
“Studies like this can help to bridge this research gap, and by understanding how loneliness or social isolation may be contributing to ill health, we can get closer to new and more effective solutions.”
Questions that remain open
The researchers suggest more research is needed to understand exactly how loneliness and social isolation affect health and to develop the most effective ways to reduce their impact.
As the study focused on middle-aged and older adults, future studies should explore whether these patterns are similar in younger people. It will also be important to investigate the effects of persistent or long-term loneliness, as the study measured loneliness at a single point in time.
The paper’s findings add to growing evidence that loneliness and social isolation are not just social issues; they are important public health concerns with wide-ranging implications for well-being and mental and physical health. The research reinforces the importance of addressing these issues as part of public health policy and practice.
Study details
Investigating relationships between loneliness, social isolation and health
Darren Hilliard, Robyn Wootton, Hannah Sallis et al.
Published in Nature Communications on 15 July 2026
Abstract
Loneliness and social isolation are important public health concerns due to their associations with a range of health outcomes. However, it is difficult to ascertain whether any effects are biased by confounding and reverse causation. We use a triangulation approach combining observational, sibling control, and Mendelian Randomisation analyses (a genetically informed analysis), to draw robust conclusions about these relationships. Using a combination of UK Biobank data (N = 8,004 to 414,432) and genome-wide association studies (N = 17,526 to 2,083,151), we examine relationships between loneliness and social isolation and outcomes related to physical health, mental health and wellbeing and general health (e.g., multimorbidity capturing both mental and physical health). We find evidence for effects of loneliness and social isolation on poorer mental health and wellbeing and of loneliness on poorer general health. We do not find evidence of effects on specific physical health outcomes; however, these effects cannot definitively be ruled out.
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