On top of that, some of the extra testosterone breaks down into estrogen, the female sex hormone, as a way for the body to stay somewhat balanced. This can lead to some unwanted physical changes. “In the back of muscle magazines, you’ll see ads for surgeries or supplements to help get rid of breasts in men,” Hoffman says. “That’s because of the steroids. The increased estrogen leads to the formation of what’s called ‘bitch tits’ in the gym.” Doctors have also seen a link between steroid use and bad cholesterol , liver cysts , kidney damage , and blood clots .