Loneliness

Loneliness is an emotional state in which a person experiences a powerful feeling of emptiness and isolation. Loneliness is more than just the feeling of wanting company or wanting to do something with another person. Loneliness is a feeling of being cut off, disconnected, and/or alienated from other people, so that it feels difficult or even impossible to have any form of meaningful human contact. Lonely people often feel empty or hollow inside. Feelings of separation or isolation from the world are common amongst those that are lonely. The first record of the word "lonely" being used was in a play by William Shakespeare.
Loneliness should not be equated with being alone. Everyone has times when they are alone for situational reasons, or because they have chosen to be alone. Being alone can be experienced as positive, pleasurable, and emotionally nourishing if it is under the individual's control. Solitude is the state of being alone and secluded from other people, and often implies having made a conscious choice to be alone.

Common Causes

People can experience loneliness for many reasons. The first experience of loneliness for most people is the first time they are left to themselves as a baby.
All kinds of life events seem to be related to loneliness. Loneliness is a very common response to divorce or the breakup of any important long-term relationship. Loneliness can be a response to a specific situation or event, such as the death or extended absence of a loved one. Loneliness may also occur after the birth of a child, after marriage or after any minor or major life event.
Loneliness can occur in marriages or similar close relationships where there is anger/resentment or a lack of "loving" communication.
Paradoxically, loneliness frequently occurs in heavily populated cities; in these cities many people feel utterly alone and cut off, even when surrounded by thousands or even millions of other people.
Loneliness can also result from low self-esteem.
Some say that loneliness has become a major problem of modern times. At the beginning of the last century families were typically larger, and very few people lived alone. Today however, the trend has reversed direction: over a quarter of the U.S. population lived alone in 1998. In 1995, 24 million Americans lived in single-person households; by 2010, it is estimated that number will have increased to around 31 million.
It's not just a problem of more people living alone. Familial connections are much more tenuous than they used to be. Nowadays, it is not at all unusual for family members to be separated by hundreds or even thousands of miles.
Learning to cope with these changes in life patterns is essential in overcoming loneliness.

Loneliness as the Human Condition?

Some existentialist philosophy views aloneness 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.
However, other existentialist thinkers argue the opposite. 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.
Also, Buddhist philosophy argues that loneliness may be completely overcome by making authentic connections to other human beings, on an emotional level. Under this viewpoint, loneliness is therefore the opposite of the natural human condition; it then becomes the lack of action against a human system as constant as hunger or thirst. Loneliness becomes the lack of action.

Effects of Loneliness

Chronic loneliness (as opposed to the normal loneliness everyone feels from time to time) is a serious, life-threatening condition. It is a major risk factor in artery erosion, high blood pressure, and stress-related conditions such as heart disease, hypertension, and stroke.
In 2005, results from the U.S. Framingham Heart Study demonstrated that lonely men had raised levels of IL-6, a blood chemical linked to heart disease.
Loneliness can play a part in alcoholism, and in children a lack of social connections is directly linked to several forms of anti-social and self-destructive behavior, most notably leaving school early dropout, along with hostile and delinquent behavior. In both children and adults, loneliness often has a negative impact on learning and memory. It can have a devastating effect on sleep patterns, and thus on the ability to function in everyday life.
Various studies have revealed that loneliness is implicated in a wide range of medical problems, some of which may not be symptomatic for years. One particularly remarkable finding, from a survey conducted by John Cacioppo who is a psychologist at the University of Chocago, is that doctors say they provide better medical care to patients who have a strong network of family and friends than they do to patients who are alone.
Among many other negative effects of loneliness, one of the most important is depression.

Treatments

It is often posited that loneliness is "the only disease that can be cured by adding two or more cases together."
Often, people mitigate loneliness by interacting with others via the Internet. However, it is widely believed that purely online relationships are no substitute for in-person relationships, an opinion based at least partially on the fact that a person's true identity is very difficult to determine on the Internet.
To the extent that loneliness is caused by depression, it may be helped by similar treatments, such as various forms of psychotherapy, pharmacotherapy (anti-depressant medications), or both.
Another treatment for both loneliness and depression is pet therapy, or animal-assisted therapy, as it is more formally known. Some studies and surveys, as well as anecdotal evidence provided by volunteer and community organizations, indicate that the presence of animal companions -- dogs, cats, and even rabbits -- can ease feelings of depression and loneliness among elderly people in nursing homes, for example. According to the Centres for Disease Control, there are a number of health benefits associated with pet ownership: In addition to easing feelings of loneliness (because of the increased opportunities for socializing with other pet owners, in addition to the companionship the animal provides), having a pet is associated with lowered blood pressure and decreased levels of cholesterol and triglycerides.

Quotations

Little do men perceive what solitude is, and how far it extendeth. For a crowd is not company, and faces are but a gallery of pictures, and talk but a tinkling cymbal, where there is no love. - Sir Francis Bacon

Loneliness is the poverty of self; solitude is the richness of self. - May Sarton

Loneliness is the worst pain in this world. It constantly eats away the person's heart, and can cause the person to hate, to feel enraged--the same rage and hate that can cause one person to kill another. It is like a wound of the heart; the type of wounds that cannot go away with a kiss or a hug. The only thing that can make this great pain go away is love and compassion, another human heart to pull them out of this hell. - Diana

Loneliness is beautiful, for it's loneliness that leads to thoughts, thoughts lead to curiosity, and curiosity to discovery and realisation - Rohit Wadhwaney

Source: Wikipedia