3 major causes for SAD

Physiological factors

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• Genetic factor

 

• hyperactivity of the amygdala in the brain that produces emotional responses (especially fear responses)

 

• Imbalance secretion of neurotransmitter in the brain

Psychological factors

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• Personality prone to anxiety, introversion, shyness and lack of self-confidence

External environmental factors

 

• Experienced unpleasantness or fear in social situations

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• Being ridiculed, bullied and rejected as a child

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• Growing up in an overly controlling and protective family