(HealthDayNews) -- Many teenage body builders and athletes mistakenly believe that taking steroids involves all gain and little risk.

Steroids -- usually synthetically made male hormones -- may pump up your body, but they can also damage it.

According to the U.S. Center for Substance Abuse Prevention, recognized side effects of steroid use may include liver tumors, fluid retention, high blood pressure, severe acne, and weakening of the tendons -- which may result in tearing or rupture.

Steroids have been illegal in the United States without a prescription since 1990.

-- Felicity Stone

Last Updated: Mar-26-2004