Caregivers of Parkinson's disease patients face responsibilities stemming from providing assistance to a person, usually a family member, who suffers a progressively disabling disease characterized by both motor and nonmotor symptoms. These circumstances impact on the physical, emotional and psychosocial aspects of the caregivers'lives and, therefore, on their quality of life (QoL). Studies have identified factors related to caregivers'global QoL and health-related QoL, causing caregivers distress and affecting their QoL.