Research has shown a generally positive correlation between a person's propensity for illness and certain psychosocial variables. This study investigated the relationship between age, sex, and degree of subscription to each of Ellis's 10 irrational beliefs and frequency and type of illness. Participants were 122 adults who were assessed on the Irrational Beliefs Test and an illness questionnaire. Participants' scores on both instruments were analyzed using a canonical correlation analysis. There was a statistically significant relationship between participants' sex, age, and subscription to irrational beliefs, and frequency and type of physical illness. Specifically, the authors found that the older the participant, and more often for women, higher need for approval, higher need for competency and achievement, lower need to find perfect solutions to problems, and to a lesser extent, higher dependency on stronger persons were correlated with a greater number of organ systems affected by illness, a greater number of chronic illnesses, and to a lesser extent, a greater total frequency of illness. Conversely, the younger the participant, and more often for men, lower need for approval from others, lower need for competency and achievement, higher need to find perfect solutions to problems, and to a lesser extent, lower dependency on others were correlated with a fewer number of organ systems affected by illness, fewer chronic illnesses, and to a lesser extent, a lower total frequency of illness. Implications of these findings for counselors are discussed.