SYNOPSISHypotheses about the involvement of physiological and personality mechanisms in the relation between stress and headache have not yet been tested in a pretreatment-post-treatment treatment design though many behavioral techniques are based on these notions. Effects of four treatments (stress-coping, stress-coping including finger temperature biofeedback, stress-coping including temporal vasoconstriction biofeedback and waiting list-control) were analysed in migraine patients with regard to headache measures, psychophysiological functioning and personality variables. In tension headache patients three treatments were compared (stress-coping, stress-coping including frontalis EMG biofeedback, and waiting list-control). Changes neither in physiological nor in personality measures showed concurrency with changes in headache variables. Our results do not confirm the hypothesis of a mediating role between stress and headache for temporal artery and frontal muscle stress responses in migraine patients and tension headache patients, respectively. Neither was the notion of involvement of personality change in headache improvement sustained. (Headache 25:310-316, 1985) While stress is mentioned as a predominant elicitor of headache complaints, in particular migraine, 1-6 the psychophysiological mechanisms by which arousing events lead to such suffering are still unknown. Cephalic artery responses to stress have been given much emphasis in theories concerning the link between stress and migraine, and, analogously, cephalic muscular responses in hypotheses with regard to tension headache. Several authors studied extracranial vasomotor responses in migraine patients' 7-10 and reactions of head muscles in tension headache patients. 7-16 So far, little evidence agrees with hypotheses of abnormal physiological responding in these groups.Assuming a mediating role for vascular and muscular responses between stress and headache it can be predicted that response decrement will accompany a reduction in headache complaints. Evaluation studies of biofeedback treatments have been focused mainly on the relation between headache improvement and changes in physiological activity under non-stress conditions. 17-22 Headache improvement, to our knowledge however, has not been related to alterations in physiological reactions to stress.Whether a stimulus will be stressful or not depends on a large number of factors, many of these subjective. It is suggested that migraine and tension headache patients experience more stress than most people due to a stress-disposed personality Structure. 14,23,24 Higher scores on measures of neuroticism, obsessive-compulsive behavior, rigidity, achievement motivation, and fear of failure have been found in both migraine and tension headache patients, but the results are inconsistent and dependent on the severity of the headache complaints. 4,23,[25][26][27][28][29] Several variants of behavioral treatment, like assertive training 30,31 and cognitive therapy, 18 start from these findings and teach the...