Decaffeinated coffee and teas have no caffeine whatsoever. Even though these drinks should have no caffeine, most contain at least a small amount. This is due to the difficult process required to produce decaffeinated drinks. Usually the small amount present in any of these items will not cause any side effects. Some clear sodas, such as Mountain Dew, contain more caffeine than a cup of coffee.
Some soft drinks have a large amount of added caffeine.
Caffeine is present in most soft drinks. Soft drinks that do not have caffeine are usually labeled caffeine free. Caffeine withdrawal can result in flu-like symptoms, as well as headaches. Caffeine withdrawal can be bothersome, although it is not life threatening. Many people report symptoms if they miss their morning cup of coffee, or attempt to stop drinking caffeine.