Loneliness is an unpleasant emotional response to perceived isolation. Loneliness is also described as social pain—a psychological mechanism which motivates individuals to seek social connections. It is often associated with an unwanted lack of connection and intimacy. Loneliness overlaps and yet is distinct from solitude. Solitude is simply the state of being apart from others; not everyone who experiences solitude feels lonely. As a subjective emotion, loneliness can be felt even when surrounded by other people; one who feels lonely, is lonely. The causes of loneliness are varied. They include social, mental, emotional, and environmental factors.
Recent data reports that in the US, considered the most advanced country in the world, almost three quarters of its population experience loneliness.
Chronic loneliness is already known for being modern day epidemic many tims leding to suicide. Social interactions and happiness have been proven to be related with life extension and loneliness is a serious risk factor for humn health and human longevity.