Carers play a vital role in supporting family members who need help. Facts and figures on caregiving are set in the context of current UK policy. Research into the impact of caregiving shows that one-third to one-half of carers suffer significant psychological distress. Factors associated with carer stress are reviewed, including those related to the care-recipient, the caregiver, their relationship, and wider family and social support. The most well-known frameworks for understanding caregiving stress, including stress-process models, are introduced. Measures that may help in assessing psychological needs of carers are reviewed, emphasising the distinction between objective and subjective stress. The range of possible interventions leads to promising evidence of the effectiveness of individual psychosocial interventions, but further research is needed.