Is mental illness congenital or acquired? Can it be "contagious"?

【Have you heard that mental illness can be contagious? Is mental illness congenital or acquired?】
Is mental illness a genetic issue, or is it purely caused by the environment? Additionally, patients often have others around them with similar mental or emotional problems, leading to the belief that mental illness can be "contagious." Is this true?
In this episode, psychiatrist Dr. Iu Wing Hang will continue to explain in "Psychiatry Science Class"!
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