The purpose of the study is to examine caregivers (N=36) to determine if thinking styles can be associated with the effectiveness of a psychoeducational group treatment based on health and caregiver burden indicators. After completing pretreatment assessments (Millon Index of Personality Styles; GHQ-12; Zarit Burden Interview), caregivers were assigned to receive the psychoeducational treatment (10 sessions). Most of the participants were medium age (M = 55.5 years, SD = 12.94). No significant pre-postreatment differences were found. Results show that Externally focused has negative implications in mental health change. Conservation-seeking was associated with a lower change in subjective burden. Taking into account the personality can increase the effectiveness of psychological interventions with caregivers.