The experience and construction of caring in 50 informal cancer carers, 35 women and 15 men, was examined using a critical realist approach and a mixed method design. Women reported higher rates of depression, anxiety, unmet needs and burden of care than men. No gender differences were found in time spent care-giving, suggesting that gendered roles are implicated in distress and coping. Semi-structured interviews with 13 carers were used to identify gender differences in caring, analysed using positioning theory.