Humans, like most other mammals, live in social groups.
Humans are exquisitely sensitive to the behavior of others around us.
Humans are motivated by a need to belong—also called the affiliation need.
We seek contact with others and approval from others.
Whenever we are deprived of human contact and approval, we feel distressed and anxious.
This is especially true when we believe that others have deliberately excluded us
Social isolation produces psychological pain in the form of depression, sadness, and anger, as well as triggering higher levels of aggressive behavior.
Social isolation also impairs physical health, leading to more frequent illness and even an earlier death.