Anabolic steroids are man-made substances related to testosterone. Bodybuilders and athletes may use anabolic steroids to build muscles and improve athletic performance. It affects a part of the brain called the limbic system m which controls mood. Long-term steroid abuse can lead to aggressive behavior and extreme mood swings. Steroid can also lead to paranoia, jealousy, delusions, feeling invincible. The effects of steroid are breast growth, shrinking of the testicles, low sperm count, increased risk of prostate cancer. For females the effects are voice deepening, growth of facial hair, male pattern baldness, changes in or end of menstrual cycle and enlargement of the clitoris.