A patient's psychological condition can be influenced by symptoms and, at the same time, it can influence the perception of symptoms. In psychological assessment, pain can modify the results of a questionnaire, so a patient's state at the moment of the evaluation should be taken into account. Questionnaires used in assessment do not always provide clear-cut answers concerning the individual psychological component. Moreover, difficulties in classifying headache patients does not permit correct comparisons between population samples whenever patients are not classified into well defined homogeneous groups. Overall, in the three groups examined - migraine, tension-type headache and cluster headache - it can be affirmed that with self-report assessment based on questionnaires, the tension-type headache subjects present a more interesting psychological profile for its clinical implications.