As of late 2025, about 20% or one in five adults age 50 or older live alone. While that’s down from 30% in 2022, it’s still much higher than the 9% of all adults who lived alone in 1950, signaling a massive social shift away from extended families living together and caring for each other across generations. As a result, more older Americans are suffering from social isolation and loneliness than ever before. The connection might not be obvious, but this loneliness epidemic among older adults can exacerbate existing health problems and even lead to new ones.
This is important to address because your state of mind affects your physical wellbeing. Though the profession of nursing has come leaps and bounds since she published Notes on Nursing in 1859, nursing pioneer Florence Nightengale’s stress on keeping patients’ rooms quiet and well-organized demonstrates an awareness of something modern medicine upholds: stress, anxiety, and depression make it harder for the body to heal. Loneliness is one of the main drivers of stress in older adults.
Isolation and Loneliness
The CDC defines social isolation as “not having relationships, contact with, or support from others.” Loneliness, on the other hand, comes from feeling like you’re missing out on connections with others or a sense of belonging. Not everyone who is isolated feels lonely; some people prefer to be by themselves. Likewise, not everyone who feels lonely is socially isolated. They might just be surrounded by people they don’t feel connected to.
The Risks of Loneliness
Loneliness also leads to stress and anxiety. Stress and anxiety can change the way you see the world. A lonely person might become depressed and distrustful of others, creating a cycle of loneliness in which they want social interaction but also avoid it because their mistrust makes it hard to connect with others. These mental changes trigger biological defense mechanisms such as high blood pressure, obesity, and cognitive decline.
These biological triggers make it harder for your body to fight off infection or heal from wounds and illness. That’s because stress, anxiety, and depression promote inflammation. Inflammation helps fight infection [link to previous article] over the short term, but chronic inflammation can lead to serious negative health effects.
Inflammation in the brain can accelerate Alzheimer’s disease and Parkinson’s disease, as this article published in Alzheimer’s & Dementia: Translational Research & Clinical Interventions found. Inflammation can also lead to atherosclerosis, or a buildup of plaque in the arteries. The effects of atherosclerosis, such as heart attack and stroke, are the leading causes of death worldwide. Chronic inflammation is also dangerous for patients with cancer, as it can stimulate the growth of cancer cells.
Combating Loneliness
Older Americans who have lost mobility, have impaired vision or hearing, or are living alone, struggling financially, or caring for an unwell loved one are at increased risk for loneliness. Treating those medical conditions and getting help caring for loved ones are key to gaining the kind of quality of life and confidence that helps people become less lonely. Financial assistance such as Medicaid is available to older adults who need it.
If you are feeling lonely, talk to a health care professional about it. When you’re dealing with physical issues, whether it is chronic pain, a wound, or a condition like diabetes, caring for the mental side is just as important to healing as treating the condition itself.
