Surgery is a branch of medicine that uses operative procedures to investigate or treat disease, repair injuries, and restore bodily structure or function. The term denotes both a medical discipline and an individual operation. Surgical practice extends beyond performing procedures: it includes establishing a diagnosis, assessing treatment options, preparing patients, and managing recovery. Operations are undertaken by trained surgeons working with anesthesia providers, nurses, and other health professionals. (facs.org)
Scope and purposes
Surgical procedures have several purposes. Diagnostic surgery obtains information about a suspected disorder, often through a biopsy that removes tissue for examination. Therapeutic surgery removes diseased tissue or corrects a structural problem. Preventive, or risk-reducing, surgery removes tissue in selected circumstances to lower the likelihood of future disease. Palliative surgery relieves symptoms without necessarily eliminating the underlying condition and may form part of palliative care. These purposes can overlap within a single procedure. (training.seer.cancer.gov)
In cancer treatment, surgery may remove a localized tumor, reduce its bulk, or relieve pain and pressure. Removed tissue can also provide information about the disease and whether it has spread. Surgery may be used alone or combined with other treatments, including radiation therapy. Its role depends on the type, location, and extent of the cancer rather than simply on whether a tumor can technically be removed. (cancer.gov)
Procedures also differ in urgency and setting. Elective surgery is planned in advance, whereas urgent or emergency surgery addresses conditions requiring more immediate intervention. “Elective” describes scheduling rather than implying that an operation is unnecessary. Some procedures occur in outpatient facilities, with discharge without an overnight stay; others require hospital admission. (facs.org)
Specialties and professional training
Surgical specialties are organized around anatomical regions, patient groups, and types of treatment. General surgery covers a broad range of conditions, particularly those involving abdominal organs and related structures. Orthopedic surgery concerns the musculoskeletal system; neurosurgery addresses disorders of the nervous system; and cardiothoracic surgery treats conditions involving the heart and other structures within the chest. (facs.org)
Other fields include vascular surgery, plastic surgery, pediatric surgery, colorectal surgery, ophthalmology, and urology. Plastic surgery encompasses reconstruction as well as procedures intended to alter appearance. Organ transplantation requires specialized operative expertise and continuing medical care. The boundaries between specialties overlap, and complex operations may involve surgeons from several disciplines. (facs.org)
Surgeons receive medical education followed by supervised postgraduate training. In the United States, specialty board certification generally involves completion of an approved residency and successful examinations. Certification, medical licensure, and membership in a professional college are distinct credentials. Training includes clinical judgment and patient management as well as operative technique. (facs.org)
Operative approaches and technology
Open surgery exposes the operative area through an incision that permits direct access. minimally invasive surgery uses smaller access openings and specialized instruments. In laparoscopy, a camera-equipped instrument transmits images from inside the body to a monitor, allowing the surgeon to work through small incisions. The approach used depends on the procedure and the clinical circumstances. (cancer.gov)
Robot-assisted surgery is a form of computer-assisted surgery in which the surgeon controls instruments through a console or comparable interface. Such systems may provide three-dimensional visualization and facilitate work in confined spaces. The devices described by the US Food and Drug Administration require direct human control; the word “robotic” does not mean that an autonomous machine independently conducts the operation. Computer-assisted systems can also support preoperative planning and surgical navigation. (fda.gov)
Anesthesia and perioperative care
Anesthesia prevents pain during surgery and other procedures. Local anesthesia affects a small area, while regional anesthesia blocks sensation in a larger region. General anesthesia produces unconsciousness; sedation reduces awareness to varying degrees. These approaches have different effects and may be combined. Anesthesia care is related to, but distinct from, the surgeon’s operative responsibilities. (nigms.nih.gov)
Perioperative care encompasses the periods before, during, and after an operation. Preoperative assessment includes review of the patient’s condition, medical history, medications, and proposed procedure. Informed consent involves explaining the operation’s purpose, expected benefits, important risks, alternatives, and likely consequences of not proceeding. Consent is a communication process, not merely the signing of a document, and does not constitute a guarantee of an outcome. (facs.org)
Postoperative care includes monitoring, pain management, wound care, and assessment for complications. Recovery requirements vary with the operation and the patient’s condition. Surgeons remain responsible for appropriate postoperative surgical care and its coordination with other professionals. (cancer.gov)
Safety and access
Potential complications include bleeding, infection, injury to nearby tissues, and adverse responses to anesthesia. Their likelihood and severity vary between procedures and patients; surgery therefore involves assessing anticipated benefits alongside possible harms. (cancer.gov)
The World Health Organization developed the Surgical Safety Checklist to support patient safety, teamwork, and communication. It structures checks before anesthesia, before incision, and before the patient leaves the operating room, including confirmation of identity, procedure, site, and consent. (who.int)
Access also depends on the capacity of the surrounding health system, including trained personnel, equipment, supplies, and functioning surgical services. Emergency and essential surgical and anesthesia care are recognized components of universal health coverage. In 2015, World Health Assembly resolution WHA68.15 established an international framework for strengthening these services, including access without financial hardship. (who.int)