George Albee, a past president of the American Psychological Association, remark

The boundaries between “normality” and “mental disorder” are fuzzy and often difficult to determine.
Symptoms fall along a continuum from mild to severe.
Some disorders are universal, but they may take different forms.
Symptoms may vary with the culture or class.
Some disorders are specific to a particular culture (culture-bound syndromes).
A few of the culture-bound syndromes listed in the DSM are:  amok (Malaysia), ataque de nervios (Latin American and Mediterranean), brain fag (West Africa), ghost sickness (American Indian), and shin-byung (Korea).
These culture-bound syndromes rarely overlap with DSM diagnostic categories, but they still cause great suffering.