Background and objectives: Severe mental disorders require informal care, usually provided by family members of the affected. The aim of the study is to examine the burden of informal caregiving for individuals with schizophrenia and affective disorders prior to hospital admission in Bulgaria. Methods: The study has an observational, cross-sectional, retrospective design. Individuals with schizophrenia and affective disorders and their caregivers are evaluated upon the patients’ admission for inpatient treatment.