Adolescent young carers (AYCs) face the challenges of adolescence while also having care responsibilities. Caring can negatively affect an adult carer’s health, but there is less evidence on how caring affects AYCs, of whom there is little awareness among professionals. The aim of this survey study was to describe the AYCs’ characteristics and investigate factors associated with their perceived health. School pupils aged 15–17 from 11 Swedish municipalities completed a questionnaire addressing caring activities, received support and perceived health. Of the 3,015 participants, 702 (23%) were AYCs. Female gender, having a parent with a health-related condition, mental illness in a family or non-family member, and addiction problems in a non-family member were associated with poorer perceived health, while receiving support with caring was associated with better perceived health. Identifying the factors associated with AYCs’ perceived health can lead to appropriate support, but there also needs to be better representation of AYCs in policy. © 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.