Social work in health originated in almshouses and hospitals in the late 19th century to assess patients' eligibility for free treatment and mobilize resources. Over time, the role has expanded from case management to addressing broader psychosocial factors through a biopsychosocial model. With health reform prioritizing prevention and primary care, social workers now provide services in hospitals and communities through activities like assessment, advocacy, and health promotion working with individuals, families, groups and organizations. The objectives of social work are to support adjustment to health conditions and guide clients, while skills in areas like complex assessment, collaboration and communication are required.