Cyclic changes in pain perception: An ROC analysis

The rating scale responses of three groups of men and women to thermal and painful radiant heat stimuli were studied over a 4-week period. Receiver operating characteristic curve parameters were computed for each of the phases of the menstrual cycle. Women with normal menstrual periods experienced a heightened sensitivity to pain during ovulation. This effect was absent in women using oral contraceptive pills and in men. The findings demonstrate that past reports of pain threshold changes in association with menstrual phase were basically sensory effects and not just a result of shifts in the observer’s criteria for reporting pain. In addition, sex differences in pain perception were found only when men were compared with women who were ovulating.