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Diagnoses illness and manages health for years afterward through examination and evidence, not a single operation — medicine's generalist and long-term guide. A physician diagnoses illness and manages a patient's health over months, years or a lifetime, using history-taking, physical examination, laboratory tests and imaging rather than a scalpel. Where a surgeon intervenes once and moves on, a physician — often an internist or general practitioner — carries a case forward across visits, weighing new symptoms against an ongoing record, adjusting medication, and deciding which specialists a case eventually needs. The distinction is old: physicians prescribed and surgeons operated for most of Western history, and licensing systems still keep the two apart.

The profession's authority once rested on inherited theory: Hippocratic humoral medicine dominated for two thousand years, refined by Galen in Rome and systematized by Ibn Sina's eleventh-century Canon of Medicine, a standard European textbook into the 1600s. Thomas Sydenham's insistence on watching disease rather than theorizing about it, then germ theory, then Abraham Flexner's 1910 report tying medical schools to universities and laboratories, turned physic from a learned guess into an evidence-based discipline — a shift still being pushed further by clinical trials and treatment guidelines today.

Training now runs to roughly a decade past secondary school in most countries, and pay, licensing and status vary enormously by nation — a hospital consultant in England, a private internist in the United States and a rural general practitioner in India do the same job differently. The newest pressure is diagnostic software: some AI systems already match or beat junior physicians on standardized case tests, sharpening rather than removing the question this page asks — what a physician does that a machine trained on the same textbooks still cannot.