Surgery: definition, methods, history, and modern practice

Types and common examples

Surgical procedures range from very minor to highly complex. Minor procedures include extractions and simple repairs—such as removing a damaged tooth through dental surgery (tooth extraction)—while major operations can involve opening the chest to repair cardiac structures (heart surgery) or transplanting organs. Surgeries are often classified as elective, urgent or emergency, and by technique as open, minimally invasive (laparoscopic), endoscopic or robotic-assisted.

Operating room, sterile technique and attire

The operating room is a controlled environment designed to reduce infection risk and support complex teamwork. Trained staff including surgeons, anaesthetists and nurses follow strict procedures for sterilizing instruments and surfaces to limit germs and contamination (infection control). Everyone in the suite wears protective and disposable attire—special clothing, surgical hats, dedicated shoes, sterile gowns, gloves and masks—and only essential personnel and the patient are present during the procedure.

Anesthesia, perioperative care and risks

Anesthesia allows most surgeries to proceed without pain. General anaesthesia renders the patient unconscious, while local and regional anaesthesia numb a specific area. Perioperative care includes preoperative assessment, intraoperative monitoring and postoperative recovery focused on pain control, wound healing and preventing complications such as bleeding, infection or organ dysfunction. Risk varies with the patient’s health, the complexity of the operation and the facility’s resources.

Specialties and disciplines

• General surgery: abdominal organs, soft tissues and trauma.
• Orthopaedics: bones, joints and musculoskeletal trauma (orthopaedic).
• Cardiothoracic surgery: heart and thoracic cavity (cardiac procedures).
• Neurosurgery: brain and spinal cord repair.
• Plastic and reconstructive surgery: restoration and aesthetic procedures.

History and modern trends

Surgical practice has evolved from rudimentary procedures in ancient societies to advanced interventions today. Key advances include the adoption of anaesthesia and antiseptic technique in the 19th century, which transformed outcomes. The late 20th century introduced minimally invasive and laparoscopic methods, and the 21st century has seen growing use of robotic assistance and image-guided surgery. Ambulatory and day-surgery models have expanded access while reducing hospital stays.

Importance, access and global considerations

Surgery is essential for treating many life-threatening and disabling conditions and contributes substantially to public health. However, access to safe surgical care varies widely worldwide; some patients travel abroad for procedures when care is unavailable or costly, a practice known as medical tourism. Efforts to improve surgical safety, train specialists, and equip facilities are central to reducing disparities in outcomes.

Further reading

For introductory material, procedural guides and professional resources see basic surgery resources and specialist pages such as those addressing orthopaedics (orthopaedic surgery), dental procedures (dental extraction), cardiac surgery (cardiac operations), nursing roles (surgical nursing), infection control (sterilization protocols) and patient safety standards covering attire and staff roles (scrubs, surgical caps, operating footwear, sterile gowns, gloving, masking) and patient preparation (preparing the patient).