Introduction: Systemic vasculitis (SV) is associated with substantial economic impact to patients and the healthcare system but little is known about the burden of SV on informal caregivers. We evaluated the objective caregiving burden experienced by informal caregivers of patients with SV.; Methods: We surveyed adult patients and their informal caregivers on the physical, emotional, social and economic impacts of SV. We asked patients about the extent to which they felt they were a burden to their identified caregivers.