Loneliness Statistics 2026: The Complete Research Overview

1 in 3

adults worldwide report feeling lonely

Gallup, 2023

61%

of young adults report feeling seriously lonely

Harvard, 2021

15 cigs

per day, equivalent health risk of chronic loneliness

Holt-Lunstad, 2015

26%

increased risk of premature death from social isolation

Holt-Lunstad meta-analysis

15%

of US men now have no close friends (vs 3% in 1990)

Survey Center on American Life, 2021

9M

people in the UK often or always feel lonely

Jo Cox Commission, 2017

3×

rise in Americans with no close friends since 1990

Survey Center on American Life

2

countries have appointed Ministers for Loneliness: UK and Japan

UK 2018, Japan 2021

Approximately 1 in 3 adults worldwide report feeling lonely.

Gallup's 2023 Global Emotions Report found that 25% of adults worldwide said they felt "very" or "fairly" lonely, with the figure rising significantly in high-income countries. This represents roughly 2 billion people.

Source: Gallup Global Emotions Report, 2023

The US Surgeon General declared loneliness an epidemic in May 2023.

In one of the most significant public health statements of recent years, US Surgeon General Dr. Vivek Murthy issued an 81-page advisory calling loneliness a public health crisis of the highest order. The report found that approximately half of American adults report measurable levels of loneliness.

Source: US Surgeon General Advisory, May 2023

The WHO established a Commission on Social Connection in 2023.

The World Health Organization designated social isolation and loneliness as a global public health priority, co-chairing a new international commission with the US and Kenyan surgeons general. The WHO estimated the economic cost of loneliness at trillions of dollars annually worldwide.

Source: World Health Organization, 2023

The UK appointed the world's first Minister for Loneliness in 2018.

Following the Jo Cox Commission on Loneliness, the UK government created a dedicated ministerial role to address loneliness as a social policy issue. The Commission found that 9 million people in the UK often or always felt lonely, more than the entire population of London.

Source: UK Government / Jo Cox Commission, 2018

Japan appointed a Minister for Loneliness in 2021.

Japan, which has among the world's highest rates of social isolation among older adults, made loneliness a cabinet-level priority after a pandemic-era spike in suicide rates, particularly among women. A 2019 survey found 18% of Japanese adults over 65 had not spoken to anyone in more than two weeks.

Source: Japanese Cabinet Office, 2021

61% of young adults aged 18–25 reported feeling seriously lonely in 2021.

Harvard's Making Caring Common project surveyed 950 Americans across age groups and found young adults were dramatically lonelier than older cohorts. The report, titled "Loneliness in America," found this was true before the pandemic and became significantly worse during it.

Source: Harvard Making Caring Common, "Loneliness in America," 2021

Adults under 35 report the highest loneliness rates of any age group globally.

Contrary to the widespread assumption that loneliness primarily affects elderly people, Gallup's 2023 research found younger adults consistently score highest on loneliness measures worldwide. The pattern holds across developed and developing economies.

Source: Gallup Global Emotions Report, 2023

15% of American men now report having no close friends, up from 3% in 1990.

The Survey Center on American Life tracked male friendship patterns from 1990 to 2021 and found a dramatic collapse in men's close social networks. Women showed a smaller but still significant decline: 10% report no close friends in 2021 vs 2% in 1990. The trend is most pronounced among younger men.

Source: Survey Center on American Life / American Enterprise Institute, 2021

49% of adults say they have fewer friends than they would like.

Cigna's longitudinal loneliness research found that friendship deficits, not just isolation, drive loneliness. Relationship quality matters as much as quantity: people can have frequent interactions and still feel profoundly alone if those interactions lack depth.

Source: Cigna Loneliness Index, 2020

Loneliness disproportionately affects immigrants and expats.

People living outside their home country report significantly higher loneliness rates than native-born residents, typically 30–40% higher. This is driven by the combination of social network disruption, cultural adjustment, and language barriers. The effect persists even after years of residence.

Source: Multiple cross-national studies; see Stroebe et al., European Psychologist

Social isolation increases the risk of premature death by 26%.

Julianne Holt-Lunstad's landmark 2015 meta-analysis, covering 148 studies and over 308,000 people, found that inadequate social connection increased mortality risk by 26%, comparable to smoking up to 15 cigarettes a day and significantly worse than obesity.

Source: Holt-Lunstad et al., PLOS Medicine, 2015

Loneliness is associated with a 29% increased risk of heart disease and 32% increased risk of stroke.

A 2016 meta-analysis published in the British Medical Journal found robust links between loneliness, social isolation, and cardiovascular disease, after controlling for established risk factors including depression. The relationship appears bidirectional: heart disease also increases isolation.

Source: Valtorta et al., British Medical Journal, 2016

Social isolation is linked to a 50% increased risk of developing dementia.

The Lancet Commission on Dementia Prevention (2020) identified social isolation as one of the 12 modifiable risk factors for dementia, accounting for approximately 4% of global dementia cases. Loneliness has also been found to accelerate cognitive decline in people already showing early symptoms.

Source: Livingston et al., The Lancet, 2020

Loneliness impairs immune function and sleep quality.

Research by Cacioppo and Hawkley found that lonely people show elevated levels of inflammatory markers, reduced natural killer cell activity, and significantly worse sleep quality than non-lonely people with similar lifestyles. The immune suppression associated with loneliness is comparable to that caused by chronic stress.

Source: Cacioppo & Hawkley, Perspectives on Psychological Science, 2008

Chronic loneliness is self-reinforcing without intervention.

Cacioppo's evolutionary framework found that loneliness creates hypervigilance toward social threat, lonely people become more likely to perceive ambiguous social signals as hostile, leading to avoidance that deepens their isolation. This loop explains why loneliness tends to worsen without active disruption.

Source: Cacioppo & Patrick, Loneliness: Human Nature and the Need for Social Connection, 2008

The share of Americans with no close friends tripled between 1990 and 2021.

Tracking data from the Survey Center on American Life shows 12% of Americans reported having no close friends in 2021, compared to just 3% in 1990. The trend accelerated sharply after 2010 and again during the pandemic, particularly among men under 30.

Source: Survey Center on American Life, 2021

The average number of close friends Americans report has declined from 2.94 in 1990 to 2.23 in 2021.

Beyond the percentage with no friends, the overall depth of social networks has shrunk. The decline is sharpest among men, lower-income adults, and people without college degrees, suggesting that economic stress compounds social fragmentation.

Source: Survey Center on American Life, 2021

Civic participation, clubs, religious groups, community organisations, has fallen 25–50% since the 1960s.

Robert Putnam's landmark study "Bowling Alone" (2000) documented the collapse of social capital across American life over four decades. Despite digital connectivity, this trend has continued. Every institution that once provided structured social contact, from bowling leagues to PTA meetings, has seen significant declines.

Source: Putnam, Bowling Alone: The Collapse and Revival of American Community, 2000

Only 26% of Americans say they feel close to people in their neighbourhood.

Pew Research found that neighbourhood connection, once a cornerstone of social life, has been sharply eroded. Fewer than 1 in 4 Americans knows the names of most of their neighbours, and fewer still describe those relationships as meaningfully close.

Source: Pew Research Center, Community & Society Survey

Heavy social media users are 1.7× more likely to feel lonely than light users.

A 2017 study in the American Journal of Preventive Medicine surveyed 1,787 US adults and found a strong dose-response relationship between social media use and loneliness, the more platforms used and time spent, the greater the loneliness. The relationship remained significant after controlling for depression and other variables.

Source: Primack et al., American Journal of Preventive Medicine, 2017

64% of Facebook users say the platform has a mostly negative effect on society.

Pew Research Center's surveys have consistently found that Americans view social media's net effect as harmful, particularly around political polarization, misinformation, and the spread of outrage. Despite this, usage remains high, a pattern consistent with other addictive products.

Source: Pew Research Center, Americans and Social Media, 2020

Social media algorithms actively reduce exposure to different viewpoints.

Extensive research, including internal studies from Facebook and Twitter, has confirmed that engagement-optimising algorithms systematically promote content that triggers emotional responses and matches existing beliefs. Cross-ideological exposure on social platforms is estimated at a fraction of what people experience in offline daily life.

Source: Multiple sources including Bail et al., Science, 2018; various Meta internal research papers

Despite global connectivity, cross-cultural understanding has not improved.

Multiple studies measuring stereotyping, cultural knowledge, and empathy across national borders have found no significant improvement in the era of social media. Increased digital connectivity has largely connected people to more of the same, rather than to genuinely different worldviews.

Source: Global Attitudes surveys; Pew Research Center Global Attitudes Project