Most physicians specialize in one of the following areas: anesthesiology, family and general medicine, general internal medicine, general pediatrics, obstetrics and gynecology, psychiatry, and surgery. The greatest number of physicians are in private practice. They see patients by appointment in their offices and examining rooms, and visit patients who are confined to the hospital. In the hospital, they may perform operations or give other kinds of medical treatment. Some physicians also make calls on patients at home if the patient is not able to get to the physician's office or if the illness is an emergency.

Anesthesiologists focus on surgical patients and pain relief. General practitioners or family practitioners see patients of all ages and both sexes. They will diagnose and treat those ailments that are not severe enough or unusual enough to require the services of a specialist. When special problems arise, however, the general practitioner will refer the patient to a specialist.

General internists diagnose and treat patients with problems that affect internal organ systems, such as the digestive tract, stomach, liver, and kidneys. General pediatricians focus on the health of infants, children, teenagers, and young adults. Obstetricians and gynecologists specialize in women's health. Psychiatrists diagnose and treat patients with mental health issues. Surgeons treat and operate on patients who are injured, deformed, or diagnosed with a disease.

Not all physicians are engaged in private practice. Some are in academic medicine and teach in medical schools or teaching hospitals. Some are engaged only in research. Some are salaried employees of health maintenance organizations or other prepaid health care plans. Some are salaried hospital employees.

Some physicians, often called medical officers, are employed by the federal government, in such positions as public health, or in the service of the Department of Veterans Affairs. State and local governments also employ physicians for public health agency work. A large number of physicians serve with the armed forces, both in this country and overseas.

Industrial physicians or occupational physicians are employed by large industrial firms for two main reasons: to prevent illnesses that may be caused by certain kinds of work and to treat accidents or illnesses of employees. Although most industrial physicians may roughly be classified as general practitioners because of the wide variety of illnesses that they must recognize and treat, their knowledge must also extend to public health techniques and to understanding such relatively new hazards as radiation and the toxic effects of various chemicals, including insecticides.

A specialized type of industrial or occupational physician is the flight surgeon. Flight surgeons study the effects of high-altitude flying on the physical condition of flight personnel. They place members of the flight staff in special low-pressure and refrigeration chambers that simulate high-altitude conditions and study the reactions on their blood pressure, pulse and respiration rate, and body temperature.

Another growing specialty is the field of nuclear medicine. Some large hospitals have a nuclear research laboratory, which functions under the direction of a chief of nuclear medicine, who coordinates the activities of the lab with other hospital departments and medical personnel. These physicians perform tests using nuclear isotopes and use techniques that let physicians see and understand organs deep within the body.

Physicians may become specialists in any of the 40 different medical care specialties.

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