Loneliness: A Public Health Crisis – Part 1
This insight is Part 1 of the series “Loneliness: A Public Health Crisis.” In this series, our U.S.-based Healthcare & Life Sciences experts delve into the pervasive impact of loneliness, examining its physical, psychological, and societal dimensions. The series aims to illuminate the nuanced challenges of loneliness and advocate for collaborative, targeted interventions to combat its effects and foster stronger, more connected communities. This first installment explores loneliness as a global challenge of increasing significance. We examine the underlying causes of human loneliness, its profound effects on mental and physical health, and its growing recognition among global policymakers.
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Loneliness has become a public health crisis of global proportions. Defined as the gap between desired and actual social connection—loneliness is more than an emotional struggle; it is a critical health issue that shortens life expectancy, impacts mental and physical well-being, and drives up healthcare costs. In the United States, one in four Americans report feeling chronically lonely.[1] Worldwide, over 40% of individuals experienced heightened feelings of loneliness after the COVID-19 pandemic, due to the required social distancing and resulting isolation.[2]
The desire for social connection is as natural as the need for food or sleep, yet addressing loneliness is uniquely challenging due to its stigmatization and subjective nature.[3] The need for meaningful connection is ingrained in human biology, but modern lifestyles increasingly leave people feeling isolated, even when surrounded by others. Humans historically depended on close-knit communities for survival, making isolation rare and perilous. Our brains still react to loneliness as a threat, an ancient survival mechanism we haven’t outgrown.[4] The consequences of loneliness exact a heavy toll on mental and physical health, which is why tackling this problem must become a priority for policymakers, healthcare providers, and communities to ensure better health outcomes and a more connected and resilient society.
Physical and Psychological Impacts
Loneliness is more than an emotional challenge—it’s a significant physical and psychological issue recognized globally as a public health crisis. When experiencing prolonged loneliness, the body can enter fight-or-flight mode as if in danger, redirecting energy to functions needed for survival. This chronic stress response leads to elevated cortisol levels, which harm brain functions, increase inflammation, and put strain on the cardiovascular system. Other bodily processes, including immune response and digestion, are effectively “shut down” as resources are diverted to prepare for threats that never arrive.[5] These effects on the body can have severe consequences; for example, chronic loneliness can slash life expectancy by up to 15 years, the same result of smoking a pack of cigarettes a day.[6]
The mental toll is equally profound. Loneliness fuels depression, anxiety, and cognitive decline, including memory loss and a higher risk of dementia.[7] It can erode self-esteem and create negative thought patterns, trapping individuals in a cycle of isolation.[8]Ultimately, breaking this cycle requires deliberate efforts to nurture meaningful connections, which are vital for both mental and physical health.
Loneliness as a Global Challenge
The profound effects of loneliness on mental and physical health have spurred policy responses worldwide, with the COVID-19 pandemic amplifying the urgency of addressing this global crisis.[9] In response, the World Health Organization (WHO) launched its Commission on Social Connection (2024–2026), aiming to spotlight loneliness as a critical health threat, prioritize social connection, and scale up effective solutions globally.[10]
Despite growing awareness of the risks and costs of loneliness, few countries have implemented targeted governmental measures. Japan and the United Kingdom stand out as pioneers, appointing Ministers for Loneliness in 2018 and 2021, respectively. These officials have emphasized international collaboration, including regular dialogue and sharing data to combat the issue.[11] Japan further enacted the 2024 Act on Promotion of Policy for Loneliness and Isolation, establishing principles and responsibilities for addressing the epidemic.[12] However, critics question whether the law adequately considers the diverse needs of different demographic groups, as loneliness often varies by age, geography, and socioeconomic background.[13]
The UK has developed a “national loneliness strategy” aimed at destigmatizing loneliness, prioritizing it in policymaking, and increasing research and awareness.[14] As the first country to create a government strategy focused on this issue, the UK has published annual updates through the Loneliness Annual Report. The 2023 report highlighted progress in strengthening government priorities and fostering international collaboration on loneliness, though it also underscored that meaningful, widespread changes in the population require sustained efforts over time.[15]
Takeaways
Loneliness is a critical global health issue with profound physical, psychological, and social consequences. It not only affects mental health—leading to depression and cognitive decline—but also has serious physical repercussions, such as increased stress and reduced life expectancy. Governments worldwide are beginning to address this epidemic, with countries like the UK and Japan taking proactive steps. However, more coordinated, tailored approaches are needed. Tackling loneliness will require global collaboration, policy integration, and a shift in societal attitudes to prioritize social connection as essential to health. By acknowledging loneliness as a public health crisis and investing in targeted policies and programs, significant improvements can be made to the well-being of individuals, while also reducing the long-term healthcare costs associated with loneliness-related issues.
Loneliness manifests differently for people of various backgrounds and demographics. The next installment of this series will address the complex disparities in loneliness by age and analyze how the workplace has exacerbated feelings of isolation.
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About the series
In the “Loneliness: A Public Health Crisis on a Mental Health Revolution” thought series, FTI Consulting experts delve into the pervasive impact of loneliness, examining its physical, psychological, and societal dimensions. The series aims to illuminate the nuanced challenges of loneliness and advocate for collaborative, targeted interventions to combat its effects and foster stronger, more connected communities. The first installment explores loneliness as a global challenge and its profound effects on mental and physical health, and its growing recognition among global policymakers. The second installment focuses on how loneliness impacts different age groups, highlighting the male loneliness epidemic that is growing by the minute. The third installment highlights the geography of loneliness and how the urban and rural divide contributed to the feeling of isolation. The fourth installment discusses the socioeconomic impact of loneliness and how it’s both a symptom and a consequence of economic instability. The final installment explores solutions to address the loneliness epidemic. See all insights in the series here.
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[1] “Cigna U.S. Loneliness Index”, Cigna (2018), https://www.multivu.com/players/English/8294451-cigna-us-loneliness-survey/docs/IndexReport_1524069371598-173525450.pdf
[2] Daniel Surkalim, Robert Eres, Adrian Bauman, ”The Prevalence of Loneliness Across 113 Countries: Systematic Review and Meta-Analysis”, BMJ (December 15, 2021), https://www.bmj.com/content/376/bmj-2021-067068
[3] Mark R. Leary, Roy F. Baumeister, “The Need To Belong: Desire for Interpersonal Attachments as a Fundamental Human Motivation”, Psychological Bulletin Volume 117: No. 3 (1995) https://www.researchgate.net/profile/Mark-Leary-2/publication/15420847_The_Need_to_Belong_Desire_for_Interpersonal_Attachments_as_a_Fundamental_Human_Motivation/links/5b647053aca272e3b6af9211/The-Need-to-Belong-Desire-for-Interpersonal-Attachments-as-a-Fundamental-Human-Motivation.pdf
[4] Theo Van Tilburg, “Social, Emoitional, and Existential Loneliness: A Test of the Multidimensional Concept”, The Gerontologist Volume 61: Issue 7 (October 2021), https://academic.oup.com/gerontologist/article/61/7/e335/5865445?login=false
[5] Firdaus S. Dhabhar, “A Hassle a Day May Keep the Pathogens Away: The Fight-or-Flight Stress Response and the Augmentation of Immune Function.” OUP Academic, Oxford University Press, 13 July 2009, https://doi.org/10.1093/icb/icp045
[6] Office of the US Surgeon General, ”Our Epidemic of Loneliness and Isolation”, Department of Health and Human Services, https://www.hhs.gov/sites/default/files/sg-social-connection-general.pdf
[7] Amy Novotney, “The Risks of Social Isolation”, American Psychological Association (May 2019), https://www.apa.org/monitor/2019/05/ce-corner-isolation
[8] Qianyi Luo, Robin Shao, The positive and negative emotion functions related to loneliness: a systematic review of behavioural and neuroimaging studies, Psychoradiology, Volume 3, 2023, kkad029, https://doi.org/10.1093/psyrad/kkad029
[9] Nina Goldman, Devi Khanna, Marie Line El Asmar, Pamela Qualter, Austen El-Osta, ”Addressing Loneliness and Social Isolation in 52 Countries: A Scoping Review of National Policies”, BMC Public Health (May 1, 2024), https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-024-18370-8#:~:text=1%2C%209%5D.-,In%20response%2C%20there%20has%20been%20significant%20policy%2Dlevel%20attention%20on,and%202021%20(Japan)%20respectively
[10] Id.
[11] Diana Barran, Tetsushi Sakamoto, “Joint Mesage From the UK and Japanese Loneliness Ministers”, UK Government Digital Service (June 17, 2021), https://www.gov.uk/government/news/joint-message-from-the-uk-and-japanese-loneliness-ministers
[12] Roseline Yong, ”Reevaluating Hikikomori and Challenging Loneliness Assumptions in Japan: A Cross-Sectional Analysis of a Nationawide Internet Sample”, National Library of Medicine (February 15, 2024), ttps://pmc.ncbi.nlm.nih.gov/articles/PMC10905745/#B13
[13] Roseline Yong, ”Reevaluating Hikikomori and Challenging Loneliness Assumptions in Japan: A Cross-Sectional Analysis of a Nationawide Internet Sample”, National Library of Medicine (February 15, 2024), ttps://pmc.ncbi.nlm.nih.gov/articles/PMC10905745/#B13
[14] ”Government’s Work On Tackling Loneliness”, UK Government Digital Services (June 21, 2024), https://www.gov.uk/guidance/governments-work-on-tackling-loneliness
[15] Department for Culture, Media & Sport, ”Tackling Loneliness Annual Report March 2023: The Fourth Year”, UK Government Digital Services (March 30, 2023), https://www.gov.uk/government/publications/loneliness-annual-report-the-fourth-year/tackling-loneliness-annual-report-march-2023-the-fourth-year
