Lydia Eloise Hall was an American nurse theorist who developed the Care, Core, Cure nursing theory in the 1960s. The theory focuses on three interlocking aspects of nursing care: care of the body, core of the patient, and cure of disease. Hall believed nursing care should be provided directly by professional nurses. The theory emphasizes caring for the whole person by addressing their physical, emotional, and spiritual needs through an ongoing relationship between nurse and patient.