Defence mechanism

In psychoanalytic theory, defense mechanisms are unconscious psychological processes that protect the self from anxiety-producing thoughts and feelings related to internal conflicts and external stressors. Defences are automatically used to protect ourselves from threats and affects to maintain psychological balance and homeostasis. Defenses are automatic responses to external stressors or internal conflicts.

Healthy people have a fully developed sense of "object constancy", knowing that bad and good can exist at the same time in the same person. A defense mechanism can become pathological when its persistent use leads to maladaptive behaviour such that the physical or mental health of the individual is adversely affected. Among the purposes of defense mechanisms is to protect the mind/self/ego from anxiety or to provide a refuge from a situation with which one cannot cope at that moment.