Anabolic steroids are synthetic steroid hormones that resemble testosterone and have both medical and negative psychological effects. They are used to treat hormonal imbalances and weight loss, but are also misused by athletes. Misuse can lead to aggression, delusions, and manias. Long-term effects include renal failure, liver damage, high blood pressure, and high cholesterol levels. Age and gender-specific effects are also observed. Teenagers are particularly affected by steroid use.