Maybe you’re better off not having the surgery but taking the painkiller.
– President Barack Obama
Physicians classify diseases in a variety of ways. Clinical classifications are often made according to either the suddenness of onset or the expected prognosis. Diseases are considered acute if they develop suddenly and have a short clinical course. Chronic diseases, on the other hand, have a slow onset, indolent course, and long duration. They heal slowly if they improve at all.