Objectives: The principle of achieving the most cost-effective level of care in relation to needs is an essential aim for all health care systems. However, it is not certain that the corresponding knowledge and attitudes with respect to the appropriate level of care for different symptoms can be found in the general population. There may be age-related differences in illness behaviour that manifest in ‘overutilisation’ of the system. We studied illness behaviour with regard to attitudes and inclination to seek care for different symptoms at various levels in the health care system.Methods: The study group consisted of a random selection of 296 persons, born in the 1940s, ′50s and ′60s, and living in a defined region in Sweden. In a questionnaire they had to choose between different levels of care for twelve symptom descriptions with varying degrees of severity. The answers were scored according to the level of care, adequacy and overutilisation.Results: The vast majority of participants chose an adequate level of care. However, overutilisation was found, particularly among women born in the 1960s and to some extent among men born in the 1940s. These two groups together constituted about 70% of all the individuals who tended to overutilise the health care in their expressed preferences.Conclusions: These individuals do not receive cost-effective care, or the most adequate care with regard to their needs. The results indicate, however, that the problem was more a question of attitude rather than a lack of knowledge and information.