People can feel lonely even if they are surrounded by a lot of other people. Loneliness can occur even to people in marriages, relationships, families and successful jobs. One cause of loneliness is a lack of friends during childhood and teenage years. Loneliness can also be caused by chronic depression. Loneliness can also be caused when a relationship or marriage ends.
Loneliness is a theme in literature, going back to the Epic of Gilgamesh.
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