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Medicine is a science and art of healing dedicated to saving lives and relieving suffering. A person becomes ill when a part of the body does not function properly. They may have been injured, caught an infectious disease or have inherited a weakness or defect in their genes. There are also psychiatric disorders of the mind. The human body is a wonderful machine capable of building and repairing itself, provides it has a good supply of fresh air, water and food. But if the illness is serious, a person may need medical aid to help then get together. Medical care begins with the diagnosis followed by to treatment cure it.