According to "Culture and Human Behavior: Culture-Bound Syndromes," the Japanese

According to "Culture and Human Behavior: Culture-Bound Syndromes," the Japanese culture-specific disorder hikkomori:

A) is very common, affecting an estimated 10 million or more people.
B) has now spread to Hong Kong, where the main symptoms are fear of being fat and physical problems such as a bloated stomach and poor appetite.
C) was once rare but has now become a social phenomenon, affecting an estimated 1 million or more young Japanese.
D) has symptoms in common with several Eastern disorders, including ataque de nervios and taijin kyofusho,.