This article details the construction & psychometric evaluation of a scale of psychache. 2 studies were conducted with 505 undergraduates. Analyses indicated the scale of psychache had strong internal consistency reliability, criterion validity for indicating various suicide criteria, & incremental validity, relative to other established psychological antecedents of suicide measures, for statistically predicting status on these suicide criteria. Findings support both the construct validity of the Psychache Scale & Shneidman’s theory that emphasizes the pre-eminence of psychache as a cause of suicide. (31 refs.)