Twenty-five patients with a diagnosis of nonorganic burning mouth syndrome were 
matched for age and sex with twenty-five patients with organically based painful 
disorders of the mouth. All patients were interviewed by a psychiatrist and 
completed the General Health Questionnaire to screen for psychiatric disorders. 
A diagnosis of psychiatric disorder based on clinical examination findings was 
made in 44% (11/25) of the patients with burning mouth syndrome and in 16% 
(4/25) of the controls.