background: premenstrual dysphoric disorder is a depressive disorder affecting 5%–8% of people with menstrual cycles. despite evidence that facial emotion detection is altered in depressive disorders, with enhanced detection of negative emotions (negativity bias), minimal research exists on premenstrual dysphoric disorder. objectives: the goal of this study was to investigate the effect of premenstrual dysphoric disorder symptoms and the premenstrual phase on accuracy and intensity at detection of facial emotions. design: cross-sectional quasi-experimental design. method: the facial emotion detection task was administered to 72 individuals assigned female at birth with no premenstrual dysphoric disorder (n=30), and provisional pmdd (n=42), based on a retrospective diagnostic and statistical manual of mental disorders—fifth edition-based measure of premenstrual dysphoric disorder. facial emotion detection was examined both irrespective of menstrual cycle phase, and as a function of premenstrual phase (yes, no). the task used neutral-to-emotional facial expression morphs (15 images/morph). participants indicated the emotion detected for each image within the progressive intensity morph. for all six basic emotions (sad, angry, fearful, happy, disgust, and surprise), two scores were calculated: accuracy of responses and the intensity within the morph at which the correct emotion was first detected (image number). results: individuals reporting moderate/severe symptoms of premenstrual dysphoric disorder had more accurate and earlier detection of disgust, regardless of cycle phase. in addition, those with provisional premenstrual dysphoric disorder detected sad emotions earlier. a premenstrual dysphoric disorder group×cycle phase interaction also emerged: individuals reporting premenstrual dysphoric disorder symptoms were more accurate at detecting facial emotions during the premenstrual phase compared to the rest of the cycle, with a large effect size for sad emotions. conclusion: the findings suggest enhanced facial emotion processing in individuals reporting symptoms of premenstrual dysphoric disorder, particularly for sadness and disgust. however, replication is required with larger samples and prospective designs. this premenstrual dysphoric disorder premenstrual emotion detection advantage suggests an adaptive cognitive mechanism in premenstrual syndrome/premenstrual dysphoric disorder, and challenges stigma surrounding premenstrual experiences.