Most receive three years training beyond medical school and their postgraduate internal medicine residency, and treat all age groups. A referral is usually required. They receive three years of additional training beyond medical school and their postgraduate internal medicine residency. They treat all ages and both sexes, and a referral is not required. General internists or general practice physicians are doctors who do not sub-specialize, but are broadly versed in the diagnosis and medical treatment of adults.
Many internists are primary care physicians.
Most do a three year residency following medical school. They treat adults, and a referral is not necessary. A surgeon is a physician who treats diseases, injuries, and deformities by operating on the body. A general surgeon is qualified to perform many common operations. General surgeons receive five years of additional training beyond medical school and their postgraduate residency.