Studies have shown that steroid use is a risk factor for heart disease. This is because steroids affect the cholesterol levels. Over a period of time the cholesterol builds up and clogs the arteries. Heart palpitations have been reported by a number of athletes on steroids. These may indicate an excited or elevated level of the central nervous system.
Impotence occurs when a user goes on and off steroids.
When steroids are first used sexual interest increases because of the heightened frequency and duration of the erections. But eventually the opposite happens and no erections can be produced. This happens when athletes use high dosages of steroids. Steroids can increase the production of stomach acid and lower the production of protective stomach mucus. This can irritate the lining of the stomach and may cause or aggravate a stomach ulcer.