Your nervous system goes into fight-or-flight mode, making it harder to sleep. When you're lonely, research shows that your brain can produce an excess of norepinephrine, a hormone that's a crucial “signal during the fight or flight response.” Loneliness can feel, to our social selves, like dire straits.
What happens to your body when you're lonely? “When you're experiencing loneliness, your levels of cortisol, a stress hormone, go up,” she says. “Cortisol can impair cognitive performance, compromise the immune system, and increase your risk for vascular problems, inflammation and heart disease.”
Insomnia, disrupted sleep or other sleep-related issues may all be physical symptoms of loneliness. Another sign is sleeping too much; often when people are feeling sad, or in this case lonely, many turn to sleep as a way to block out how they feel.
Research has linked social isolation and loneliness to higher risks for a variety of physical and mental conditions: high blood pressure, heart disease, obesity, a weakened immune system, anxiety, depression, cognitive decline, Alzheimer's disease, and even death.
If you've experienced ongoing feelings of loneliness, it can have negative effects on your physical health. It could lead to weight gain, sleep deprivation, poor heart health, and a weakened immune system. Loneliness can also put your body under more stress than normal.
Loneliness is associated with higher blood pressure and heart disease — it literally breaks our hearts. A 2015 meta-review of 70 studies showed that loneliness increases the risk of your chance of dying by 26 percent.
When you're lonely, research shows that your brain can produce an excess of norepinephrine, a hormone that's a crucial “signal during the fight or flight response.” Loneliness can feel, to our social selves, like dire straits.
"Lacking encouragement from family or friends, those who are lonely may slide into unhealthy habits," Valtorta says. "In addition, loneliness has been found to raise levels of stress, impede sleep and, in turn, harm the body. Loneliness can also augment depression or anxiety."
"Loneliness can change the neurochemistry of the brain, turning off the dopamine neurons, which trigger the reward response, and causing some degeneration in the brain when the reward response is not activated," says Katherine Peters, MD, PhD, FAAN, associate professor of neurology and neurosurgery at Duke University.
What causes loneliness? There is not one single cause of loneliness. Loneliness can often be a result of life changes or circumstances that include living alone, changing your living arrangements, having financial problems, or death of a loved one.
Loneliness affects people in different ways, and for this reason there are four distinct types of loneliness identified by psychologists: emotional, social, situational and chronic.
Feeling lonely can also have a negative impact on your mental health, especially if these feelings have lasted a long time. Some research suggests that loneliness is associated with an increased risk of certain mental health problems, including depression, anxiety, low self-esteem, sleep problems and increased stress.
A report from the National Academies of Sciences, Engineering, and Medicine (NASEM) points out that more than one-third of adults aged 45 and older feel lonely, and nearly one-fourth of adults aged 65 and older are considered to be socially isolated.
Psychologists generally consider loneliness to be a stable trait, meaning that individuals have different set-points for feeling loneliness, and they fluctuate around these set-points depending on the circumstances in their lives.
Highlights. Loneliness was associated with posttraumatic stress symptoms at both time points. Social loneliness was longitudinally associated with posttraumatic stress symptoms. Emotional loneliness was longitudinally associated with posttraumatic stress symptoms.
It is not surprising that loneliness hurts. A brain imaging study showed that feeling ostracized actually activates our neural pain matrix. In fact, several studies show that ostracizing others hurts us as much as being ostracized ourselves.
It can cause mental health problems, such as anxiety, emotional distress, addictions, or depression. Loneliness can also increase the risk of suicidal death. Decreased sleep quality: Chronic loneliness can result in difficulty falling asleep and/or interrupted sleep.
This means that, ideally, you should spend 70% of your time together and thirty percent of your time apart. During the time apart, you do you. You can continue your hobbies and enjoy your interests with other people. Remember, 70/30 is a guideline and is a great place to start.
People need at least a little human contact in order to thrive, and true isolation can take a toll on your overall well-being. If you're not totally isolated, though, and your lack of friends doesn't trouble you, it can be perfectly fine to be satisfied with your own company.
The brains of lonely people tend to show different patterns of activation when they think about themselves and others (even people close to them), and lower levels of activity in the medial prefrontal cortex compared to non-lonely people, a 2019 study found.
Loneliness is associated with ill-health
Yet, loneliness also impacts cognition and has been shown in longitudinal studies to predict cognitive decline (Shankar, Hamer, McMunn & Steptoe, 2013) and risk for Alzheimer's disease (Wilson et al., 2007).