Internists are doctors who specialize in treating diseases of the body in relation to one or more internal organ system. For example, diabetes is a chronic disease that affects the pancreas and can affect other body organ systems if left untreated. Usually, these doctors work as General Practitioners (GPs) or opt to specialize in one area of the body, such as cardiology. Another option is for doctors of internal medicine to specialize in working with a particular population, for example the elderly or geriatric medicine. A person specializing in internal medicine assists patients with specific disorders and those with more general complaints. For example, the doctor may specialize in gastroenterology, but he or she can also treat general complaints such as the flu or pink eye. Internal medicine is very broad and enables the doctor to work with patients suffering from many different diseases or disorders.