The World Health Organization classifies loneliness as a global public health priority, estimating that about 16% of people worldwide, roughly one in six, experience it. In November 2023, the WHO established a dedicated Commission on Social Connection to tackle the problem over a three-year period, with its flagship report launching on June 30, 2025.
What the WHO Commission on Social Connection Does
The Commission is co-chaired by Chido Mpemba of Zimbabwe and Vivek Murthy, the former U.S. Surgeon General. Its core mission is to raise the visibility of loneliness and social isolation, push governments to invest in proven solutions, and create ways to measure progress. The Commission operates from 2024 through 2026, and its flagship report offers practical steps that governments and other organizations can take to help people feel more connected.
This is the first time a major international health body has treated loneliness not as a personal failing or a side effect of aging, but as a structural health risk requiring coordinated policy responses.
How Many People Are Affected
The WHO’s estimate of 16% global prevalence translates to well over a billion people. Contrary to what many assume, loneliness is most common among adolescents and younger adults, not older people. Around 11.8% of older adults experience loneliness, while rates among young people run considerably higher.
Data from international education assessments shows that almost twice as many young people worldwide reported feeling lonely in 2018 compared to 2000, with a steep increase after 2012. The COVID-19 pandemic made things dramatically worse. In Germany, for example, loneliness among children and adolescents had hovered between 9.5% and 15.5% from 2003 to 2017, then spiked to 34.6% in 2020. By 2024, the rate had fallen but settled at 20.5%, still well above pre-pandemic levels. Girls consistently report higher levels of loneliness than boys across nearly every measurement period.
School environments appear to play a major role. Studies focusing on loneliness specifically within schools found even sharper increases between 2012 and 2018, suggesting that social exclusion in educational settings is a key driver of declining well-being among young people.
Physical Health Risks
Loneliness does measurable damage to the body. People who report chronic loneliness have a 56% higher risk of stroke compared to those who are consistently not lonely, according to research tracked over multiple time points. Even people who felt lonely only at a single assessment still faced a 25% higher stroke risk. These numbers held up after researchers accounted for other risk factors like smoking, obesity, and existing heart conditions.
You may have heard the claim that loneliness is as dangerous as smoking 15 cigarettes a day. That comparison, widely cited in media and policy discussions, is more nuanced than it sounds. When researchers directly compared the mortality risks of social isolation, loneliness, and cigarette smoking using the same datasets, smoking was typically more hazardous for cancer and overall mortality. For cardiovascular disease specifically, social isolation (having few relationships) carried a risk similar to smoking, but the subjective feeling of loneliness alone did not reach the same level. The cigarette comparison is useful for conveying that loneliness has real physical consequences, but it overstates the equivalence.
Loneliness and Dementia
A large-scale analysis of multiple population-based studies found that feeling lonely increases the risk of dementia by 31%. The breakdown by type: a 14% increased risk for Alzheimer’s disease, 17% for vascular dementia, and 12% for cognitive impairment that doesn’t yet meet the threshold for a dementia diagnosis. These results held even after controlling for depression and social isolation, meaning loneliness operates as an independent risk factor. You can be surrounded by people, not meet clinical criteria for depression, and still face elevated dementia risk if you feel persistently disconnected.
The Economic Cost
Loneliness drives up healthcare spending and reduces productivity. A systematic review of cost-of-illness studies found that the excess costs linked to loneliness and social isolation range from $2 billion to $25.2 billion per year, depending on the country and which costs are measured. Nearly every study in the review found significant excess costs.
On the other side of the ledger, investing in social connection programs appears to pay off. Studies measuring social return on investment found that for every dollar spent on interventions addressing loneliness, the return ranged from $2.28 to $13.72 in reduced healthcare use and improved productivity. That makes loneliness interventions not just a public health measure but a financially sound one.
Why It Hits Young People Hardest
The assumption that loneliness is primarily an older person’s problem has been overturned by the data. Adolescents and young adults now report the highest rates globally. Several forces converge to explain this. The rise of smartphone-based social interaction after 2012 correlates with the sharpest increases in youth loneliness across countries. School environments, where young people spend most of their waking hours, can amplify feelings of exclusion. And the pandemic disrupted social development during critical years, with many young people still not fully recovering their sense of connection four years later.
The gender gap is persistent. Girls report loneliness at higher rates than boys across nearly every wave of data collected over two decades. Researchers have found this pattern in studies spanning from 2003 through 2024, with only a single measurement period where the difference was not statistically significant.
What the WHO Wants Governments to Do
The Commission’s flagship report, set for release in mid-2025, is designed to give governments a practical framework. The emphasis is on scaling up interventions that already have evidence behind them, rather than starting from scratch. This includes building social infrastructure (community spaces, programs that bring people together across age groups), training healthcare systems to screen for social isolation, and integrating social connection into urban planning and education policy.
The WHO frames this as a problem that cuts across income levels, age groups, and geography. Loneliness is not concentrated in wealthy, individualistic societies. It appears at significant rates everywhere researchers have measured it, which is precisely why the organization treats it as a global priority requiring coordinated international attention.