Three types of doctors 2)Specialists Certain fields of medicine require advanced training and skill. One specialist is the surgeon who treats diseases by means of surgical operations Some doctors prefer to treat onl ly certain kinds of illness thus becoming specialists in their chosen fields. Other doctors often consult them when a patient needs their special skill and knowledge. Fok example, a general practitioner may refer a pregnant woman to an obstetrician.The obstetrician cares for her and delivers her bal by pediatrician, who specialize in childhood diseases. asoke over the care of the infantThree types of doctors 2) Specialists Certain fields of medicine require advanced training and skill. One specialist is the surgeon, who treats diseases by means of surgical operations. Some doctors prefer to treat only certain kinds of illness, thus becoming specialists in their chosen fields. Other doctors often consult them when a patient needs their special skill and knowledge. For example, a general practitioner may refer a pregnant woman to an obstetrician. The obstetrician cares for her and delivers her baby. A pediatrician, who specialize in childhood diseases, then take over the care of the infant