Patient-initiated violence may pose a significant risk to the strength and longevity of informal caregiving relationships in psychosis. We aimed to assess caregiver reports of patient-initiated violence in early psychosis and to examine the relationship between violent incidents and appraisals of caregiving, perceived mental wellbeing in caregivers and Expressed Emotion (EE) in the caregiving relationship. Eighty psychosis caregivers were recruited via Early Intervention (EI) psychosis services in London, United Kingdom. Caregivers were questioned about their experiences of patient-initiated violence during the semi-structured Camberwell Family Interview, and completed the Experience of Caregiving Inventory and the RAND SF-36 health survey in a cross-sectional experimental design. One third of the sample reported at least one incident of patient-initiated violence. Reports of violence were associated with poorer mental wellbeing scores amongst caregivers and more negative appraisals of caregiving. Patient-initiated violence also correlated with greater criticism and hostility expressed towards patients, and a rating of high EE in caregiver reports. The results underscore the need to ask explicitly and routinely about the physical safety of caregivers looking after someone with psychosis. Families should be directed towards appropriate interventions to help manage any risk of violence and the likely negative impact on the caregiving relationship.