The human body is remarkably complex. Despite all the scientific prowess of modern medicine, it happens that a patient complains of an ailment that no one can identify. Some diseases affect more than one organ or system at a time or are similar to another condition, which confuses the issue.
Internal medicine is a medical specialty. Rather than focusing on a single organ or group of organs (system), it focuses on internal organs as a whole. When a disease or condition affects several different systems simultaneously and the diagnosis would require various medical specialists, an internist is the doctor to consult.
