Answer:
When the defense mechanisms are too weak to cope with anxiety
Explanation:
Sigmund Freud took a strong interest in anxiety throughout his career, infact the psychoanalysis for social anxiety disorder is based on psychodynamic theory that is attributed to him.
According to Freud, anxiety is a feeling of impending danger.
He explained that defense mechanisms are unconsciously used strategies that a person uses to to protect themselves from anxiety.
They include repression, denial projection and regression.
Anxiety will most likely occur when these defense mechanisms are too weak to cope with the anxiety.