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Clinical diagnoses of depression, self-reported negative emotions, and personality traits have been associated with both the development and progression of coronary heart disease (CHD). This article focusses on negative affectivity (the tendency to experience negative emotions) and social inhibition (the tendency to inhibit self-expression in social interaction) in CHD patients. Two independent samples of patients with CHD were included in this study. Both empirical and internal-structural criteria were used to devise a brief self-report measure comprising an eight-item negative affectivity and an eight-item social inhibition scale in Sample 1 (N=400). These scales were internally consistent (α=.89 and .82), stable over time (three-month test-retest reliability=.78 and .87) and were validated against standard personality scales. CHD patients with a “distressed” personality (Type-D) report high levels of negative …