Is loneliness a very negative emotion? What is the significance of its existence?

Loneliness is a reflection of closed psychology, and it is a kind of loneliness and depression caused by feeling isolated or rejected by the outside world.

Generally speaking, short-term or accidental loneliness will not cause psychological and behavioral disorders, but long-term or severe loneliness will cause some emotional disorders and reduce people's mental health level. Loneliness will also increase alienation and alienation from others and society, and alienation and alienation will strengthen people's sense of loneliness, which will inevitably lead to physiological disorders of alienated individuals over time.