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 a perceived 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 a person is surrounded by other people. Hence, there is a distinction between being alone and feeling lonely. Loneliness can be short term or long term. In either case, it can be intense and painful.