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6 Ways Loneliness Can Harm Your Health — and How to Cut Your Risks

Surgeon General’s report is a reminder that stronger social ties mean longer lives


spinner image a lonely woman in a green shirt resting her chin on her hands in her bedroom
South_agency / Getty Images

Doctors check your blood pressure, cholesterol and weight. Maybe they should ask you about your social life, too.

That’s because people who struggle with social connection — whether they feel lonely, have few relationships or have troubled relationships — face multiple physical and mental health risks, according to a recent advisory from U.S. Surgeon General Vivek H. Murthy. The nation’s “epidemic of loneliness and isolation has been an underappreciated public health crisis,” Murthy said in his announcement about the report, released May 3.

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The impact is big, with social disconnection shortening lives by about as much as smoking 15 cigarettes a day, according to the advisory. The causes are complex, with loneliness and isolation affecting everything from inflammation levels in our bodies to the odds that we’ll exercise, eat well or get to a hospital quickly in a crisis. And the problem is widespread: Even before the start of the COVID-19 pandemic, surveys found nearly half of U.S. adults felt lonely.

We’re also spending more time alone and have fewer friends. Half of adults counted three or fewer close friends in 2021, up from a quarter of adults in 1990. The evidence that all of this is very bad for our health “has been building for decades and across multiple scientific disciplines,” says Julianne Holt-Lunstad, a professor of psychology and neuroscience at Brigham Young University in Provo, Utah. Hold-Lunstad was the scientific editor for the advisory.

Here are six health risks that people who are chronically lonely or isolated face, according to the report.

1. Premature death

People with strong social bonds live longer and are less likely to die from any cause. One review of 148 studies that followed people for an average of more than seven years found that such bonds increased survival odds by 50 percent. That made social disconnection more dangerous than drinking too much, weighing too much or exercising too little, the advisory said.

2. Heart disease and stroke

Evidence is particularly strong that social disconnection is linked with poor cardiovascular health. People with poor social relationships face a 29 percent increased risk for heart disease and a 32 percent increased risk of stroke, according to data from 16 studies.

A 2022 statement from the American Heart Association (AHA) agreed that social isolation and loneliness can increase the risks of having or dying from heart attacks and strokes. Lonely or isolated people who already have heart disease are more likely to die from it; and those who’ve had one stroke may be at higher risk for another, says Crystal Wiley Cené, M.D., a professor of clinical medicine and chief administrative officer for health equity, diversity and inclusion at University of California San Diego Health. She chaired the writing group for the AHA’s statement.

3. Diabetes

People with weak social ties are more likely to get diabetes and are less able to manage it well, studies have found. They also are more likely to suffer complications from the disease, such as heart attacks, vision loss, foot problems and kidney damage, regardless of their blood sugar levels.

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4. Infections

In one study, people exposed to a cold virus were much less likely to get sick if they had at least six social roles (parent, spouse, friend, family member, coworker or club member), compared with if they had three or fewer roles. A study of COVID-19 vaccination showed weaker immune responses in people who felt disconnected from their neighbors.

5. Cognitive decline and dementia

Adults over age 50 who were followed for an average of six years were about 50 percent more likely to develop dementia if they experienced prolonged loneliness and social isolation, a research review found. Another study that looked at midlife adults found those who were persistently lonely were more likely to later develop Alzheimer’s disease, the most common type of dementia. Additional research has found faster cognitive decline in adults over 65 who report loneliness.

6. Depression and anxiety

It may not be surprising that loneliness and isolation can lead to poor mental health. And the connection goes both ways: Depression and anxiety can cause people to withdraw and feel lonelier. But research also shows that having someone to confide in can sometimes stave off depression, even in people at high risk. Social connection also may lower the risk of suicide, especially for men. 

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The link between loneliness and your health

The links between social disconnection and poor health are rooted in our most basic biology, as well as our psychological and behavioral responses, experts say.

“Penguins who huddle together stay warmer,” and humans aren’t much different, says researcher Kerstin Gerst Emerson, a clinical associate professor at the University of Georgia. “We’ve always survived better if we are together.”

“The mortality impact of being socially disconnected is similar to that caused by smoking up to 15 cigarettes a day, and even greater than that associated with obesity and physical inactivity.”

— U.S. Surgeon General’s Advisory on the Healing Effects of Social Connection and Community

 

Brigham Young University’s Holt-Lunstad says multiple biological mechanisms are at work. One that may be particularly important, she notes, is chronic inflammation, which is linked to many different diseases and is often elevated in socially isolated people.

Spikes in stress hormones, immune system disturbances and changes in gut microbes also may play roles, the Surgeon General’s advisory says. All that dysregulation can cause a lot of “wear and tear on the body over time,” Holt-Lunstad says.

But loneliness and isolation also change how people behave. For example, having someone around to encourage you to take your medications and go to the doctor when needed may help you manage your health problems, says Cené of UC San Diego Health.

Other people also may help you eat better and move more, Emerson says. “If you’re lonely and alone — and this happened to a lot of us during the pandemic — maybe you just eat a bowl of cereal for dinner because you can’t be bothered to make a whole meal for yourself.”

The person who walks half a block on their own might take a much longer walk with a friend. And having a friend or neighbor who checks in on you regularly can literally save your life, she says.

How to Widen Your World

Feeling lonely or isolated? Start with small steps, suggests researcher Kerstin Gerst Emerson. That might mean something as simple as walking outside and smiling at another person. “It’s going to make a difference to you, but also the person you just smiled at,” she says.

Can’t get out? Call and check in on a neighbor. “Making that conscious effort to reach out is really important,” Emerson says. “And if you don’t want to do it for yourself, maybe think, ‘I’m going to make a difference in someone else's life.’ ”

Other ideas from the surgeon general’s advisory on social connection:

  • Reach out to at least one friend or family member every day.
  • Minimize distractions when you are with other people. Don’t check your phone at a meal.
  • Join fitness, hobby, religious, professional or service groups.
  • Spend less time on activities that make you feel disconnected. This can include time on social media.
  • If you are struggling, tell your health care providers.

Some people with social anxiety or other deep-rooted difficulties will benefit from therapy, Emerson says. For others, she adds, practical solutions — such as a regular ride to church or the local senior center — can make a world of difference.

Join AARP on July 11 at 6:30 p.m. ET for a Happiness Empower Hour. The free online event will focus on simple yet effective steps you can take to connect with people and improve your overall well-being. For more information and to register for the live event, visit AARP’s Virtual Community Center.

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