Paris Syndrome is almost exclusively experienced by Japanese tourists in France.
It happens to about 20 people every year when they realize that Paris isn't as romantic and beautiful as they expected, the culture shock causing people to feel sick, anxious, dizzy and hallucinate. The problem even seems to be getting worse as more people from other East Asian countries get enough money to travel to Paris.
Apparently the only cure for this is to leave France and never return.
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3rd of January