Paris syndrome is a condition exhibited by some individuals when visiting or going on vacation to Paris, as a result of extreme shock at discovering that Paris is different from their expectations. The syndrome is characterized by a number of psychiatric symptoms such as acute delusional states, hallucinations, feelings of persecution (perceptions of being a victim of prejudice, aggression, or hostility from others), derealization, depersonalization, anxiety, and also psychosomatic manifestations such as dizziness, tachycardia, sweating, and others, such as vomiting. Similar syndromes include Jerusalem syndrome and Stendhal syndrome. The condition is commonly viewed as a severe form of culture shock. It is particularly noted among Japanese travellers.

Japanese visitors are observed to be especially susceptible. It was first noted in Nervure, the French journal of psychiatry, in 2004. From the estimated six million yearly visitors, the number of reported cases is not large: according to an administrator at the Japanese embassy in France, around 20 Japanese tourists a year are affected by the syndrome. Women are also said to be susceptible, particularly those in their early thirties on their first international trip. The journal also identified two types of the affliction: Those who have previous history of psychiatric problems and those without morbid history who exhibit the delayed-expression type.

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