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Medicine is the science, art, and discipline of taking care of a patient and assisting the diagnosis, prevention, therapy or palliation of his/her injury or ailment. Medicine encompasses various health care disciplines developed to keep and restore health either by the cure and prevention of disease or the delay of its arrival. The field of medicine covers almost all the subjects on earth and there are absolutely uncountable numbers of specialists who are involved in medicine. In the United States alone, there are more than 2 million physicians licensed to practice medicine and many more specialists who practice medicine as their profession. The number of people involved in medicine is almost as high.

The science and art of medicine have developed over the years to meet the needs of the people in curing their diseases. Medicine uses all the scientific tools and techniques to solve the problems of the human body and to aid the patients in their recovery. The major part of medicine is that of treating and preventing diseases. In order to treat a disease, medicine uses the scientific method of treating the cause of the disease, relieving the patient of the symptoms, and eventually preventing the recurrence of the disease. Different methods of medicine such as pharmacology, obstetrics and gynecology, nutrition, infectious disease, personal medicine, surgery, pathology, radiography, computer medicine etc are used for treating the patients. Sometimes surgery is also required in case of serious ailments or injuries.

There are different branches of medicine such as ophthalmology, pediatric medicine, internal medicine, hematology, cardiology, neurology, gastroenterology, internal medicine, liver medicine, pediatrics, pulmonology, surgery, psychiatry, gastroenterology, surgery, dermatology, orthopedics, surgery, pediatrics, radiation oncology and surgery. All these branches of medicine employ different set of medical principles and methods for treating and preventing diseases. Today it is a complete science, which includes all the applied sciences which are broadly divided into two branches called medicinal science and biological medicine. In addition to this there is another branch of medicine called nursing science which mainly concerns with providing health education, prevention and therapy to the patients. Even though there is a considerable amount of difference between the two branches of medicine, they are both useful for the modern medical science.