Aspirin is best known as being the cheapest and oldest painkillers on the market. Felix Hoffman, a German scientist, created aspirin to help treat his dad’s arthritis. After that, Hoffman popularized the painkiller in 1899 and was known as acetylsalicylic acid. Now, it is used to ease minor aches and headaches. The way aspirin works is that it reduces the substance in the body that causes inflammation and fever. Doctors recommend taking an aspirin on a daily basis to prevent a heart attack or stroke. People that have ulcers or cardiovascular problems are often advised to take other painkillers because aspirin may make conditions worse. In addition, some Americans are allergic to aspirin. It is estimated that Americans consume more than 15 billion aspirin tablets a year.