People have know since ancient times that aspirin lessens pain and lowers high body temperature.But that is not all the drug can do. It has gained important new uses
in recent years.Small amounts may help prevent a stroke or heart attack. Some researchers
say aspirin may help patients with colon cancer live longer,or may even prevent some cancers.
But doctors also warn that the acid in aspirin can cause problems like bleeding in the stomach and intestines.
so,how did aspirin become so important? the story begins with a willow tree. Two thousand years ago, the Greek doctor Hippocrates advised his patients to chew on the bark and leaves of the willow.