Overview

Residency is the stage of medical training that follows graduation from medical school. During residency, physicians work as trainees under the supervision of senior doctors in hospitals and clinics, developing the knowledge, judgment, and technical skills required to practice in a specific specialty. In many countries, completing an accredited residency is a mandatory step before independent clinical practice or specialist certification.

Structure and common terms

Programs are organized by specialty—examples include internal medicine, family medicine, surgery, psychiatry and others—and vary in length and intensity. Trainees are often described by the year of postgraduate training (PGY‑1, PGY‑2, etc.). In some systems and stages alternative titles are used: for instance, the term senior house officer or registrar appears in the United Kingdom nomenclature. In the United States, most residents enter programs through a matching process and progress through a sequence of supervised responsibilities that increase with experience.

Training components

Residency blends inpatient and outpatient care, supervised procedures, on‑call duties, educational conferences and, in many programs, protected time for research or quality improvement projects. Typical elements include:

  • Rotations through core and subspecialty services to build breadth and depth of experience.
  • Direct patient care under the oversight of attending physicians and senior residents.
  • Formal teaching such as lectures, morning reports and simulation training.
  • Work-hour policies and supervision standards intended to protect patient safety and trainee well‑being; for example, some accrediting bodies limit weekly work hours.

Duration and specialties

Length depends on the specialty: many primary care programs (family medicine, internal medicine) are commonly three years, psychiatry programs are typically longer in many countries, and surgical subspecialties such as neurosurgery can extend to five to seven years or more. After completing residency, some physicians pursue fellowships for further subspecialization and eligibility for additional board certification.

Selection, accreditation and certification

Entrance to residency commonly involves application processes that evaluate academic records, examination results, letters of recommendation and interviews. In the United States applicants often use centralized services and participate in a national matching service; program accreditation and training standards are overseen by national bodies such as the ACGME. Successful completion of an accredited program is typically required to sit for specialty certification exams and to obtain unrestricted clinical privileges.

International variations and notable facts

Systems differ internationally: the pathway, titles and timing vary across countries. The role a trainee performs and the point at which one is considered an independent specialist are regulated locally. Many physicians, after finishing residency, pursue additional fellowships or academic careers; others move directly into clinical practice. Distinguishing residency from undergraduate medical education and from later fellowship training helps clarify responsibilities and expectations during these distinct phases of a physician's professional development.

For further general information about specialties and training pathways see resources on specialty selection (specialties overview), surgical training (surgical residency), mental health training (psychiatry residency) and complex surgical pathways such as neurosurgery.