Final answer:
The mental hygiene movement had the unforeseen consequence of increasing stigma surrounding mental health.
Step-by-step explanation:
An unforeseen consequence of the mental hygiene movement was the increased stigma surrounding mental health. While the movement aimed to promote mental health and improve understanding of unconscious desires, it unintentionally led to negative attitudes and discrimination towards individuals with mental health conditions. This stigma hindered progress in recognizing and addressing mental health issues in society.