Informal caregivers are increasingly performing medical/nursing tasks in the home for adult care recipients, often without adequate support. In the current study, using data from the Caregiving in the U.S. 2015 survey (N = 1,248), we examined associations between performing medical/nursing tasks and caregiver well-being (e.g., physical strain, emotional stress, burden of care). Overall, 58% of caregivers performed medical/nursing tasks. Compared to those who did not, those performing tasks had higher risk of emotional stress, physical strain, and high burden of care.