[Pain assessment and documentation in patients with tumors: theory and reality].

: Each tumor patient with pain is not only entitled to a careful diagnostic workup and to effective treatment of his pain syndrome, but also to a clear and useful documentation of the course of his pain(s). This documentation ('pain evolution chart') should at least include the main location(s) of the treated pain and the varying pain intensity during the course of the day as well as at night. A respective pain documentation instrument, the St. Gallen Pain Evolution Chart (S-PEC), was presented as a practical example, together with a brief review of the literature. The 'pain evolution chart' should be a regular part of the patient's hospital chart, as it forces the patient and his care-givers to cope more constructively with the present pain syndrome. The (well instructed) patient himself is responsible for an accurate and realistic pain documentation. Such longitudinal 'pain evolution charts' are not only useful for clinical oncology practice but also for clinical pain and analgesic research.