Loneliness is a complex and usually unpleasant emotional response to isolation. Loneliness typically includes anxious feelings about a lack of connection or communication with other beings, both in the present and extending into the future. As such, loneliness can be felt even when surrounded by other people and one who feels lonely, is lonely. The causes of loneliness are varied and include social, mental, emotional, and physical factors.
Research has shown that loneliness is prevalent throughout society, including people in marriages, relationships, families, veterans, and those with successful careers. It has been a long explored theme in the literature of human beings since Classical antiquity. Loneliness has also been described as social pain—a psychological mechanism meant to motivate an individual to seek social connections. Loneliness is often defined in terms of one's connectedness to others, or more specifically as "the unpleasant experience that occurs when a person's network of social relations is deficient in some important way".
People can experience loneliness for many reasons, and many life events may cause it, such as a lack of friendship relations during childhood and adolescence, or the physical absence of meaningful people around a person. At the same time, loneliness may be a symptom of another social or psychological problem, such as chronic depression.
Many people experience loneliness for the first time when they are left alone as infants. It is also a very common, though normally temporary, consequence of a breakup, divorce, or loss of any important long-term relationship. In these cases, it may stem both from the loss of a specific person and from the withdrawal from social circles caused by the event or the associated sadness.
The loss of a significant person in one's life will typically initiate a grief response; in this situation, one might feel lonely, even while in the company of others. Loneliness may also occur after the birth of a child (often expressed in postpartum depression), after marriage, or following any other socially disruptive event, such as moving from one's home town into an unfamiliar community, leading to homesickness. Loneliness can occur within unstable marriages or other close relationships of a similar nature, in which feelings present may include anger or resentment, or in which the feeling of love cannot be given or received. Loneliness may represent a dysfunction of communication, and can also result from places with low population densities in which there are comparatively few people to interact with. Loneliness can also be seen as a social phenomenon, capable of spreading like a disease. When one person in a group begins to feel lonely, this feeling can spread to others, increasing everybody's risk for feelings of loneliness. People can feel lonely even when they are surrounded by other people.
A twin study found evidence that genetics account for approximately half of the measurable differences in loneliness among adults, which was similar to the heritability estimates found previously in children. These genes operate in a similar manner in males and females. The study found no common environmental contributions to adult loneliness.
Feeling lonely vs. being socially isolated
There is a clear distinction between feeling lonely and being socially isolated (for example, a loner). In particular, one way of thinking about loneliness is as a discrepancy between one's necessary and achieved levels of social interaction, while solitude is simply the lack of contact with people. Loneliness is therefore a subjective experience; if a person thinks they are lonely, then they are lonely. People can be lonely while in solitude, or in the middle of a crowd. What makes a person lonely is the fact that they need more social interaction or a certain type of social interaction that is not currently available. A person can be in the middle of a party and feel lonely due to not talking to enough people. Conversely, one can be alone and not feel lonely; even though there is no one around that person is not lonely because there is no desire for social interaction. There have also been suggestions that each person has their own optimal level of social interaction. If a person gets too little or too much social interaction, this could lead to feelings of loneliness or over-stimulation.
Solitude can have positive effects on individuals. One study found that, although time spent alone tended to depress a person's mood and increase feelings of loneliness, it also helped to improve their cognitive state, such as improving concentration. Furthermore, once the alone time was over, people's moods tended to increase significantly. Solitude is also associated with other positive growth experiences, religious experiences, and identity building such as solitary quests used in rites of passages for adolescents.
Loneliness can also play an important role in the creative process. In some people, temporary or prolonged loneliness can lead to notable artistic and creative expression, for example, as was the case with poets Emily Dickinson and Isabella di Morra, and numerous musicians. This is not to imply that loneliness itself ensures this creativity, rather, it may have an influence on the subject matter of the artist and more likely be present in individuals engaged in creative activities.
Transient vs. chronic loneliness
The other important typology of loneliness focuses on the time perspective. In this respect, loneliness can be viewed as either transient or chronic. It has also been referred to as state and trait loneliness.
Transient (state) loneliness is temporary in nature, caused by something in the environment, and is easily relieved. Chronic (trait) loneliness is more permanent, caused by the person, and is not easily relieved. For example, when a person is sick and cannot socialize with friends would be a case of transient loneliness. Once the person got better it would be easy for them to alleviate their loneliness. A person who feels lonely regardless of if they are at a family gathering, with friends, or alone is experiencing chronic loneliness. It does not matter what goes on in the surrounding environment, the experience of loneliness is always there.
Loneliness as a human condition
The existentialist school of thought views loneliness as the essence of being human. Each human being comes into the world alone, travels through life as a separate person, and ultimately dies alone. Coping with this, accepting it, and learning how to direct our own lives with some degree of grace and satisfaction is the human condition.
Some philosophers, such as Sartre, believe in an epistemic loneliness in which loneliness is a fundamental part of the human condition because of the paradox between people's consciousness desiring meaning in life and the isolation and nothingness of the universe. Conversely, other existentialist thinkers argue that human beings might be said to actively engage each other and the universe as they communicate and create, and loneliness is merely the feeling of being cut off from this process.
In his recent text, Evidence of Being: The Black Gay Cultural Renaissance and the Politics of Violence, Darius Bost draws from Heather Love's theorization of loneliness to delineate the ways in which loneliness structures black gay feeling and literary, cultural productions. Bost limns, “As a form of negative affect, loneliness shores up the alienation, isolation, and pathologization of black gay men during the 1980s and early 1990s. But loneliness is also a form of bodily desire, a yearning for an attachment to the social and for a future beyond the forces that create someone’s alienation and isolation."
There are several estimates and indicators of loneliness. It has been estimated that approximately 60 million people in the United States, or 20% of the total population, feel lonely. Another study found that 12% of Americans have no one with whom to spend free time or to discuss important matters. Other research suggests that this rate has been increasing over time. The General Social Survey found that between 1985 and 2004, the number of people the average American discusses important matters with decreased from three to two. Additionally, the number of Americans with no one to discuss important matters with tripled (though this particular study may be flawed). In the UK research by Age UK shows half a million people more than 60 years old spend each day alone without social interaction and almost half a million more see and speak to no one for 5 or 6 days a week. On the other hand, the Community Life Survey, 2016 to 2017, by the UK's Office for National Statistics, found that young adults in England aged 16 to 24 reported feeling lonely more often than those in older age groups.
Loneliness appears to have intensified in every society in the world as modernization occurs. A certain amount of this loneliness appears to be related to greater migration, smaller household sizes, a larger degree of media consumption (all of which have positive sides as well in the form of more opportunities, more choice in family size, and better access to information), all of which relates to social capital.
Within developed nations, loneliness has shown the largest increases among two groups: seniors and people living in low-density suburbs. Seniors living in suburban areas are particularly vulnerable, for as they lose the ability to drive, they often become "stranded" and find it difficult to maintain interpersonal relationships.
Loneliness is prevalent in vulnerable groups in society. In New Zealand the fourteen surveyed groups with the highest prevalence of loneliness most/all of the time in descending order are: disabled, recent migrants, low income households, unemployed, single parents, rural (rest of South Island), seniors aged 75+, not in the labour force, youth aged 15–24, no qualifications, not housing owner-occupier, not in a family nucleus, Māori, and low personal income.
Americans seem to report more loneliness than any other country, though this finding may simply be an effect of greater research volume. A 2006 study in the American Sociological Review found that Americans on average had only two close friends in which to confide, which was down from an average of three in 1985. The percentage of people who noted having no such confidant rose from 10% to almost 25%, and an additional 19% said they had only a single confidant, often their spouse, thus raising the risk of serious loneliness if the relationship ended. The modern office environment has been demonstrated to give rise to loneliness. This can be especially prevalent in individuals prone to social isolation who can interpret the business focus of co-workers for a deliberate ignoring of needs.
Whether a correlation exists between Internet usage and loneliness is a subject of controversy, with some findings showing that Internet users are lonelier and others showing that lonely people who use the Internet to keep in touch with loved ones (especially seniors) report less loneliness, but that those trying to make friends online became lonelier. On the other hand, studies in 2002 and 2010 found that "Internet use was found to decrease loneliness and depression significantly, while perceived social support and self-esteem increased significantly" and that the Internet "has an enabling and empowering role in people's lives, by increasing their sense of freedom and control, which has a positive impact on well-being or happiness." The one apparently unequivocal finding of correlation is that long driving commutes correlate with dramatically higher reported feelings of loneliness (as well as other negative health impacts).
Loneliness has been linked with depression, and is thus a risk factor for suicide. Émile Durkheim has described loneliness, specifically the inability or unwillingness to live for others, i.e. for friendships or altruistic ideas, as the main reason for what he called egoistic suicide. In adults, loneliness is a major precipitant of depression and alcoholism. People who are socially isolated may report poor sleep quality, and thus have diminished restorative processes. Loneliness has also been linked with a schizoid character type in which one may see the world differently and experience social alienation, described as the self in exile.
While the long term effects of extended periods of loneliness are little understood, it has been noted that people who are isolated or experience loneliness for a long period of time fall into a “ontological crisis” or “ontological insecurity,” where they are not sure if they or their surroundings exist, and if they do, exactly who or what they are, creating torment, suffering, and despair to the point of palpability within the thoughts of the person.
In children, a lack of social connections is directly linked to several forms of antisocial and self-destructive behavior, most notably hostile and delinquent behavior. In both children and adults, loneliness often has a negative impact on learning and memory. Its disruption of sleep patterns can have a significant impact on the ability to function in everyday life.
Research from a large-scale study published in the journal Psychological Medicine, showed that "lonely millennials are more likely to have mental health problems, be out of work and feel pessimistic about their ability to succeed in life than their peers who feel connected to others, regardless of gender or wealth.”
In 2004, the United States Department of Justice published a study indicating that loneliness increases suicide rates profoundly among juveniles, with 62% of all suicides that occurred within juvenile facilities being among those who either were, at the time of the suicide, in solitary confinement or among those with a history of being housed thereof.
Pain, depression, and fatigue function as a symptom cluster and thus may share common risk factors. Two longitudinal studies with different populations demonstrated that loneliness was a risk factor for the development of the pain, depression, and fatigue symptom cluster over time. These data also highlight the health risks of loneliness; pain, depression, and fatigue often accompany serious illness and place people at risk for poor health and mortality.
Suicide, suicidal thoughts, attempts at suicide as a result of loneliness happen. In an article written for the American Foundation for Suicide Prevent Dr. Jeremy Noble writes, “You don’t have to be a doctor to recognize the connection between loneliness and suicide.” As feelings of loneliness intensify so do thoughts of suicide and attempts at suicide The loneliness that triggers suicidal tendencies impacts all facets of society.
Samaritan, a nonprofit in England, who work with people in crisis says there is a definite correlation between feelings of loneliness and suicide for juveniles and those in their young adult years. The Office of National Statistics, in England, found one of the top ten reasons young people have suicidal idealizations and attempt suicide is because they are lonely.College students, lonely, away from home, living in new unfamiliar surroundings, away from friends feel isolated and without proper coping skills will turn to suicide as a way to fix the pain of loneliness. A common theme, among children and young adults dealing with feelings of loneliness is they didn’t know help was available, or where to get help. Loneliness, to them, is a source of shame.
Older people, specifically senior citizens also struggle with feelings of severe loneliness which lead them to considering or acting outs on thoughts of suicide. Retirement, poor health, loss of a significant other or other family or friends, all contribute to loneliness. The isolation leads to loneliness; the loneliness leads to suicidal thoughts or actions. Suicides caused by loneliness in seniors can sometime be difficult to identify. Often they don’t have anyone to disclose their feelings of loneliness and the despair it brings. They will stop eating, alter the doses of medications they should take, choose not to treat an illness leading as a way to help expedite death so they don’t have to deal with feeling lonely.
Cultural influences can also cause loneliness leading to suicidal thoughts or actions. For example, Hispanic and Japanese cultures value interdependence. When a person from one of these cultures feels removed or feels they can’t sustain relationships in their families or society they turn negative behaviors which include social thoughts or actions. Other cultures, such as Caucasian have a culture that is more independent, culturally.While the cause of loneliness in a person may stem from different circumstances or cultural norms the impact lead to the same results, a desire to end life.
Chronic loneliness can be a serious, life-threatening health condition. It has been found to be associated with an increased risk of stroke and cardiovascular disease. Loneliness shows an increased incidence of high blood pressure, high cholesterol, and obesity.
Loneliness is shown to increase the concentration of cortisol levels in the body. Prolonged, high cortisol levels can cause anxiety, depression, digestive problems, heart disease, sleep problems, and weight gain.
″Loneliness has been associated with impaired cellular immunity as reflected in lower natural killer (NK) cell activity and higher antibody titers to the Epstein Barr Virus and human herpes viruses". Because of impaired cellular immunity, loneliness among young adults shows vaccines, like the flu vaccine, to be less effective. Data from studies on loneliness and HIV positive men suggests loneliness increases disease progression.
Physiological mechanisms link to poor health
There are a number of potential physiological mechanisms linking loneliness to poor health outcomes. In 2005, results from the American Framingham Heart Study demonstrated that lonely men had raised levels of Interleukin 6 (IL-6), a blood chemical linked to heart disease. A 2006 study conducted by the Center for Cognitive and Social Neuroscience at the University of Chicago found loneliness can add thirty points to a blood pressure reading for adults over the age of fifty. Another finding, from a survey conducted by John Cacioppo from the University of Chicago, is that doctors report providing better medical care to patients who have a strong network of family and friends than they do to patients who are alone. Cacioppo states that loneliness impairs cognition and willpower, alters DNA transcription in immune cells, and leads over time to high blood pressure. Lonelier people are more likely to show evidence of viral reactivation than less lonely people. Lonelier people also have stronger inflammatory responses to acute stress compared with less lonely people; inflammation is a well known risk factor for age-related diseases.
When someone feels left out of a situation, they feel excluded and one possible side effect is for their body temperature to decrease. When people feel excluded blood vessels at the periphery of the body may narrow, preserving core body heat. This class protective mechanism is known as vasoconstriction.
Treatments and prevention
There are many different ways used to treat loneliness, social isolation, and clinical depression. The first step that most doctors recommend to patients is therapy. Therapy is a common and effective way of treating loneliness and is often successful. Short-term therapy, the most common form for lonely or depressed patients, typically occurs over a period of ten to twenty weeks. During therapy, emphasis is put on understanding the cause of the problem, reversing the negative thoughts, feelings, and attitudes resulting from the problem, and exploring ways to help the patient feel connected. Some doctors also recommend group therapy as a means to connect with other sufferers and establish a support system. Doctors also frequently prescribe anti-depressants to patients as a stand-alone treatment, or in conjunction with therapy. It may take several attempts before a suitable anti-depressant medication is found.
Alternative approaches to treating depression are suggested by many doctors. These treatments include exercise, dieting, hypnosis, electro-shock therapy, acupuncture, and herbs, amongst others. Many patients find that participating in these activities fully or partially alleviates symptoms related to depression.
Another treatment for both loneliness and depression is pet therapy, or animal-assisted therapy, as it is more formally known. Studies and surveys, as well as anecdotal evidence provided by volunteer and community organizations, indicate that the presence of animal companions such as dogs, cats, rabbits, and guinea pigs can ease feelings of depression and loneliness among some sufferers. Beyond the companionship the animal itself provides there may also be increased opportunities for socializing with other pet owners. According to the Centers for Disease Control and Prevention there are a number of other health benefits associated with pet ownership, including lowered blood pressure and decreased levels of cholesterol and triglycerides.
Nostalgia has also been found to have a restorative effect, counteracting loneliness by increasing perceived social support.
A 1989 study found that the social aspect of religion had a significant negative association with loneliness among elderly people. The effect was more consistent than the effect of social relationships with family and friends, and the subjective concept of religiosity had no significant effect on loneliness.
One study compared the effectiveness of four interventions: improving social skills, enhancing social support, increasing opportunities for social interaction, addressing abnormal social cognition (faulty thoughts and patterns of thoughts). The results of the study indicated that all interventions were effective in reducing loneliness, possibly with the exception of social skill training. Results of the meta-analysis suggest that correcting maladaptive social cognition offers the best chance of reducing loneliness.
- Peplau, L.A.; Perlman, D. (1982). "Perspectives on loneliness". In Peplau, Letitia Anne; Perlman, Daniel (eds.). Loneliness: A sourcebook of current theory, research and therapy. New York: John Wiley and Sons. pp. 1–18. ISBN 978-0-471-08028-2.
- Cacioppo, John; Patrick, William, Loneliness: Human Nature and the Need for Social Connection, New York : W.W. Norton & Co., 2008. ISBN 978-0-393-06170-3. Science of Loneliness.com Archived 1 September 2008 at the Wayback Machine
- Pittman, Matthew; Reich, Brandon (2016). "Social media and loneliness: Why an Instagram picture may be worth more than a thousand Twitter words". Computers in Human Behavior. 62: 155–167. doi:10.1016/j.chb.2016.03.084.
- Parker, Pope (1 December 2009). "Why loneliness can be contagious". The New York Times. Archived from the original on 28 March 2013. Retrieved 10 December 2012.
- "Feeling Alone Together: How Loneliness Spreads". Time.com. 1 December 2009. Archived from the original on 8 October 2010. Retrieved 10 December 2012.
- Boomsma, Dorret I.; Willemsen, Gonneke; Dolan, Conor V.; Hawkley, Louise C.; Cacioppo, John T. (2005). "Genetic and Environmental Contributions to Loneliness in Adults: The Netherlands Twin Register Study". Behavior Genetics. 35 (6): 745–52. CiteSeerX 10.1.1.453.498. doi:10.1007/s10519-005-6040-8. PMID 16273322.
- Suedfeld, P. (1989). "Past the reflection and through the looking-glass: Extending loneliness research". In Hojat, M.; Crandall, R. (eds.). Loneliness: Theory, research and applications. Newbury Park, California: Sage Publications. pp. 51–6.
- Larson, R.; Csikszentmihalyi, M.; Graef, R. (1982). "Time alone in daily experience: Loneliness or renewal?". In Peplau, Letitia Anne; Perlman, Daniel (eds.). Loneliness: A sourcebook of current theory, research and therapy. New York: John Wiley and Sons. pp. 41–53. ISBN 978-0-471-08028-2.
- Suedfeld, P. (1982). "Aloneness as a healing experience". In Peplau, Letitia Anne; Perlman, Daniel (eds.). Loneliness: A sourcebook of current theory, research and therapy. New York: John Wiley and Sons. pp. 54–67. ISBN 978-0-471-08028-2.
- de Jong-Gierveld, J.; Raadschelders, J. (1982). "Types of loneliness". In Peplau, Letitia Anne; Perlman, Daniel (eds.). Loneliness: A sourcebook of current theory, research and therapy. New York: John Wiley and Sons. pp. 105–19. ISBN 978-0-471-08028-2.
- Duck, S. (1992). Human relations (2nd ed.). London: Sage Publications.
- An Existential View of Loneliness Archived 27 September 2010 at the Wayback Machine - Carter, Michele; excerpt from Abiding Loneliness: An Existential Perspective, Park Ridge Center, September 2000
- Tomšik, Robert (2015). Relationship of loneliness and meaning of life among adolescents. In Current Trends in Educational Science and Practice VIII : International Proceedings of Scientific Studies. Nitra: UKF. pp. 66–7. ISBN 978-80-558-0813-0.
- Love, H. K. (1 January 2001). ""SPOILED IDENTITY": Stephen Gordon's Loneliness and the Difficulties of Queer History". GLQ: A Journal of Lesbian and Gay Studies. 7 (4): 487–519. doi:10.1215/10642684-7-4-487. ISSN 1064-2684.
- Bost, Darius (2019). Evidence of Being. University of Chicago Press. doi:10.7208/chicago/9780226589961.001.0001. ISBN 9780226589824.
- Christakis, N. A. & Fowler, J. H. (2009). Connected: The surprising power of our social networks and how they shape our lives. New York, NY: Little, Brown and Company.
- Olds, J. & Schwartz, R. S. (2009). The lonely American: Drifting apart in the 21st century. Boston, MA: Beacon Press
- Fischer, Claude S. (2009). "The 2004 GSS Finding of Shrunken Social Networks: An Artifact?". American Sociological Review. 74 (4): 657–669. doi:10.1177/000312240907400408.
- Half a million older people spend every day alone, poll shows Archived 6 January 2017 at the Wayback Machine The Guardian
- Loneliness - What characteristics and circumstances are associated with feeling lonely? Archived 25 July 2018 at the Wayback Machine Analysis of characteristics and circumstances associated with loneliness in England using the Community Life Survey, 2016 to 2017. Published by the Office for National Statistics. Published 10 April 2018. Retrieved 25 July 2018.
- "Most Senior Citizens Experience Loneliness, Say Researchers". Archived from the original on 26 December 2011. Retrieved 19 August 2012.
- "Archived copy". Archived from the original on 15 August 2013. Retrieved 25 March 2012.CS1 maint: archived copy as title (link)
- "Isolation and Dissatisfaction in the Suburbs". Planetizen: The Urban Planning, Design, and Development Network. Archived from the original on 24 January 2012. Retrieved 25 March 2012.
- "Stranded Seniors". governing.com. Archived from the original on 1 December 2012. Retrieved 25 March 2012.
- Comber, Cathy. "Ms". www.loneliness.org.nz. Archived from the original on 8 October 2018. Retrieved 8 October 2018.
- McPherson, M.; Smith-Lovin, L.; Brashears, M. E. (2006). "Social Isolation in America: Changes in Core Discussion Networks over Two Decades". American Sociological Review. 71 (3): 353–75. CiteSeerX 10.1.1.101.6700. doi:10.1177/000312240607100301.
- Wright, Sarah (16 May 2008). Loneliness in the Workplace. VDM Verlag Dr. Mull Ed Beasleyschaft & Co. ISBN 978-3-639-02734-1.
- Hughes, Carole (1999). The relationship of use of the Internet and loneliness among college students (PhD Thesis). Boston College. OCLC 313894784.
- Sum, Shima; Mathews, R. Mark; Hughes, Ian; Campbell, Andrew (2008). "Internet Use and Loneliness in Older Adults". CyberPsychology & Behavior. 11 (2): 208–11. doi:10.1089/cpb.2007.0010. PMID 18422415.
- Shaw, Lindsay H.; Gant, Larry M. (2002). "In Defense of the Internet: The Relationship between Internet Communication and Depression, Loneliness, Self-Esteem, and Perceived Social Support". CyberPsychology & Behavior. 5 (2): 157–71. CiteSeerX 10.1.1.563.2946. doi:10.1089/109493102753770552. PMID 12025883.
- "Is the Internet the Secret to Happiness?". Time. 14 May 2010. Archived from the original on 25 April 2012. Retrieved 25 March 2012.
- The Dangers of Loneliness - Marano, Hara Estroff; Psychology Today Thursday 21 August 2003
- Shelkova, Polina (2010). "Loneliness". Archived from the original on 30 May 2012. Retrieved 14 July 2013.
- Marano, Hara. "The Dangers of Loneliness". Retrieved 10 December 2012.
- Hawkley, Louise C; Cacioppo, John T (2003). "Loneliness and pathways to disease". Brain, Behavior, and Immunity. 17 (1): 98–105. doi:10.1016/S0889-1591(02)00073-9. PMID 12615193.
- Masterson, James F.; Klein, Ralph (1995). Disorders of the Self: Secret Pure Schizoid Cluster Disorder. pp. 25–7.
Klein was Clinical Director of the Masterson Institute and Assistant Professor of Psychiatry at the Columbia University College of Physicians and Surgeons, New York
- Mark Berman (9 June 2015). "Kalief Browder and what we do and don't know about solitary confinement in the U.S." The Washington Post. Archived from the original on 22 April 2019. Retrieved 14 March 2019.
- "Testimony of Professor Craig Haney; Senate Judiciary Subcommittee on the Constitution, Civil Rights, and Human Rights Hearing on Solitary Confinement" (PDF). United States Senate. 19 June 2012. Archived (PDF) from the original on 24 September 2018. Retrieved 14 March 2019.
- Loneliness linked to major life setbacks for millennials, study says Archived 25 July 2018 at the Wayback Machine. The Guardian. Author - Nicola Davis. Published 24 April 2018. Retrieved 25 July 2018.
- Lonely young adults in modern Britain: findings from an epidemiological cohort study Archived 25 July 2018 at the Wayback Machine. Psychological Medicine. Authors - Timothy Matthews (a1), Andrea Danese (a1) (a2), Avshalom Caspi (a1) (a3), Helen L. Fisher (a1), Sidra Goldman-Mellor (a4), Agnieszka Kepa (a1), Terrie E. Moffitt (a1) (a3), Candice L. Odgers (a5) (a6) and Louise Arseneault (a1). Published online on 24 April 2018. Published by Cambridge University Press. Retrieved 25 July 2018.
- Jaremka, L.M., Andridge, R.R., Fagundes, C.P., Alfano, C.M., Povoski, S.P., Lipari, A.M., Agnese, D.M., Arnold, M.W., Farrar, W.B., Yee, L.D. Carson III, W.E., Bekaii-Saab, T., Martin Jr, E.W., Schmidt, C.R., & Kiecolt-Glaser, J.K. (2014). Pain, depression, and fatigue: Loneliness as a longitudinal risk factor. Health Psychology, 38, 1310-1317.
- Nobel, Jeremy; MD; MPH; Founder; President; Art, Foundation for; Healing (25 September 2018). "Forging Connection Against Loneliness". AFSP. Retrieved 13 December 2019.
- Stravynski, Ariel; Boyer, Richard (2001). "Loneliness in Relation to Suicide Ideation and Parasuicide: A Population-Wide Study". Suicide and Life-Threatening Behavior. 31 (1): 32–40. doi:10.1521/suli.126.96.36.19912. ISSN 1943-278X.
- "Young people and suicide". Samaritans. Retrieved 13 December 2019.
- "PortalGuard - Portal Access". bcportalguard.butte.edu. Retrieved 13 December 2019.
- "Loneliness and Isolation: Modern Health Risks". The Pfizer Journal. IV (4). 2000. Archived from the original on 28 January 2006.
- Cacioppo, J.; Hawkley, L. (2010). "Loneliness Matters: A Theorectical and Empirical Review of Consequences and Mechanisms". Annals of Behavioral Medicine. 40 (2): 218–227. doi:10.1007/s12160-010-9210-8. PMC 3874845. PMID 20652462.
- "Chronic stress puts your health at risk". Archived from the original on 9 May 2017. Retrieved 7 June 2018.
- Jaremka, Lisa M.; Fagundes, Christopher P.; Glaser, Ronald; Bennett, Jeanette M.; Malarkey, William B.; Kiecolt-Glaser, Janice K. (2013). "Loneliness predicts pain, depression, and fatigue: Understanding the role of immune dysregulation". Psychoneuroendocrinology. 38 (8): 1310–7. doi:10.1016/j.psyneuen.2012.11.016. PMC 3633610. PMID 23273678.
- Jaremka, Lisa M.; Fagundes, Christopher P.; Peng, Juan; Bennett, Jeanette M.; Glaser, Ronald; Malarkey, William B.; Kiecolt-Glaser, Janice K. (2013). "Loneliness Promotes Inflammation During Acute Stress". Psychological Science. 24 (7): 1089–97. doi:10.1177/0956797612464059. PMC 3825089. PMID 23630220.
- Ijzerman, Hans. "Getting the cold shoulder". The New York Times. Archived from the original on 9 December 2012. Retrieved 1 November 2012.
- "Psychotherapy". Depression.com. Archived from the original on 17 December 2009. Retrieved 29 March 2008.
- "The Truth About Antidepressants". WebMD. Archived from the original on 10 December 2010. Retrieved 30 March 2008.
- "Alternative treatments for depression". WebMD. Retrieved 30 March 2008.
- Health Benefits of Pets Archived 15 March 2017 at the Wayback Machine (from the Centers for Disease Control and Prevention). Retrieved 14 November 2007.
- Zhou, Xinyue; Sedikides, Constantine; Wildschut, Tim; Gao, Ding-Guo (2008). "Counteracting Loneliness: On the Restorative Function of Nostalgia". Psychological Science. 19 (10): 1023–9. doi:10.1111/j.1467-9280.2008.02194.x. PMID 19000213.
- Johnson, D. P.; Mullins, L. C. (1989). "Religiosity and Loneliness Among the Elderly". Journal of Applied Gerontology. 8: 110–31. doi:10.1177/073346488900800109.
- Masi, C. M.; Chen, H.-Y.; Hawkley, L. C.; Cacioppo, J. T. (2010). "A Meta-Analysis of Interventions to Reduce Loneliness". Personality and Social Psychology Review. 15 (3): 219–66. doi:10.1177/1088868310377394. PMC 3865701. PMID 20716644.